diff --git a/backend/internal/service/account.go b/backend/internal/service/account.go
index 0b225dac..6e5a768f 100644
--- a/backend/internal/service/account.go
+++ b/backend/internal/service/account.go
@@ -1432,6 +1432,14 @@ func (a *Account) getExtraString(key string) string {
 	return ""
 }
 
+// getExtraStringDefault 从 Extra 中读取指定 key 的字符串值，不存在时返回 defaultVal
+func (a *Account) getExtraStringDefault(key, defaultVal string) string {
+	if v := a.getExtraString(key); v != "" {
+		return v
+	}
+	return defaultVal
+}
+
 // getExtraInt 从 Extra 中读取指定 key 的 int 值
 func (a *Account) getExtraInt(key string) int {
 	if a.Extra == nil {
@@ -1498,6 +1506,10 @@ func (a *Account) GetQuotaNotifyDailyThreshold() float64 {
 	return a.getExtraFloat64("quota_notify_daily_threshold")
 }
 
+func (a *Account) GetQuotaNotifyDailyThresholdType() string {
+	return a.getExtraStringDefault("quota_notify_daily_threshold_type", "fixed")
+}
+
 func (a *Account) GetQuotaNotifyWeeklyEnabled() bool {
 	return a.getExtraBool("quota_notify_weekly_enabled")
 }
@@ -1506,6 +1518,10 @@ func (a *Account) GetQuotaNotifyWeeklyThreshold() float64 {
 	return a.getExtraFloat64("quota_notify_weekly_threshold")
 }
 
+func (a *Account) GetQuotaNotifyWeeklyThresholdType() string {
+	return a.getExtraStringDefault("quota_notify_weekly_threshold_type", "fixed")
+}
+
 func (a *Account) GetQuotaNotifyTotalEnabled() bool {
 	return a.getExtraBool("quota_notify_total_enabled")
 }
@@ -1514,6 +1530,10 @@ func (a *Account) GetQuotaNotifyTotalThreshold() float64 {
 	return a.getExtraFloat64("quota_notify_total_threshold")
 }
 
+func (a *Account) GetQuotaNotifyTotalThresholdType() string {
+	return a.getExtraStringDefault("quota_notify_total_threshold_type", "fixed")
+}
+
 // nextFixedDailyReset 计算在 after 之后的下一个每日固定重置时间点
 func nextFixedDailyReset(hour int, tz *time.Location, after time.Time) time.Time {
 	t := after.In(tz)
diff --git a/backend/internal/service/balance_notify_service.go b/backend/internal/service/balance_notify_service.go
index 0d7e4c09..65cec594 100644
--- a/backend/internal/service/balance_notify_service.go
+++ b/backend/internal/service/balance_notify_service.go
@@ -82,19 +82,29 @@ func (s *BalanceNotifyService) CheckBalanceAfterDeduction(ctx context.Context, u
 
 // quotaDim describes one quota dimension for notification checking.
 type quotaDim struct {
-	name      string
-	enabled   bool
-	threshold float64
-	oldUsed   float64
-	limit     float64
+	name          string
+	enabled       bool
+	threshold     float64
+	thresholdType string // "fixed" (default) or "percentage"
+	oldUsed       float64
+	limit         float64
+}
+
+// resolvedThreshold returns the effective threshold value.
+// For percentage type, it computes threshold = limit * percentage / 100.
+func (d quotaDim) resolvedThreshold() float64 {
+	if d.thresholdType == "percentage" && d.limit > 0 {
+		return d.limit * d.threshold / 100
+	}
+	return d.threshold
 }
 
 // buildQuotaDims returns the three quota dimensions for notification checking.
 func buildQuotaDims(account *Account) []quotaDim {
 	return []quotaDim{
-		{quotaDimDaily, account.GetQuotaNotifyDailyEnabled(), account.GetQuotaNotifyDailyThreshold(), account.GetQuotaDailyUsed(), account.GetQuotaDailyLimit()},
-		{quotaDimWeekly, account.GetQuotaNotifyWeeklyEnabled(), account.GetQuotaNotifyWeeklyThreshold(), account.GetQuotaWeeklyUsed(), account.GetQuotaWeeklyLimit()},
-		{quotaDimTotal, account.GetQuotaNotifyTotalEnabled(), account.GetQuotaNotifyTotalThreshold(), account.GetQuotaUsed(), account.GetQuotaLimit()},
+		{quotaDimDaily, account.GetQuotaNotifyDailyEnabled(), account.GetQuotaNotifyDailyThreshold(), account.GetQuotaNotifyDailyThresholdType(), account.GetQuotaDailyUsed(), account.GetQuotaDailyLimit()},
+		{quotaDimWeekly, account.GetQuotaNotifyWeeklyEnabled(), account.GetQuotaNotifyWeeklyThreshold(), account.GetQuotaNotifyWeeklyThresholdType(), account.GetQuotaWeeklyUsed(), account.GetQuotaWeeklyLimit()},
+		{quotaDimTotal, account.GetQuotaNotifyTotalEnabled(), account.GetQuotaNotifyTotalThreshold(), account.GetQuotaNotifyTotalThresholdType(), account.GetQuotaUsed(), account.GetQuotaLimit()},
 	}
 }
 
@@ -104,6 +114,9 @@ func (s *BalanceNotifyService) CheckAccountQuotaAfterIncrement(ctx context.Conte
 	if account == nil || s.emailService == nil || s.settingRepo == nil || cost <= 0 {
 		return
 	}
+	if !s.isAccountQuotaNotifyEnabled(ctx) {
+		return
+	}
 	adminEmails := s.getAccountQuotaNotifyEmails(ctx)
 	if len(adminEmails) == 0 {
 		return
@@ -114,22 +127,26 @@ func (s *BalanceNotifyService) CheckAccountQuotaAfterIncrement(ctx context.Conte
 		if !dim.enabled || dim.threshold <= 0 {
 			continue
 		}
+		effectiveThreshold := dim.resolvedThreshold()
+		if effectiveThreshold <= 0 {
+			continue
+		}
 		newUsed := dim.oldUsed + cost
-		if dim.oldUsed < dim.threshold && newUsed >= dim.threshold {
-			s.asyncSendQuotaAlert(adminEmails, account.Name, dim, newUsed, siteName)
+		if dim.oldUsed < effectiveThreshold && newUsed >= effectiveThreshold {
+			s.asyncSendQuotaAlert(adminEmails, account.Name, dim, newUsed, effectiveThreshold, siteName)
 		}
 	}
 }
 
 // asyncSendQuotaAlert sends quota alert email in a goroutine with panic recovery.
-func (s *BalanceNotifyService) asyncSendQuotaAlert(adminEmails []string, accountName string, dim quotaDim, newUsed float64, siteName string) {
+func (s *BalanceNotifyService) asyncSendQuotaAlert(adminEmails []string, accountName string, dim quotaDim, newUsed, effectiveThreshold float64, siteName string) {
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
 				slog.Error("panic in quota notification", "recover", r)
 			}
 		}()
-		s.sendQuotaAlertEmails(adminEmails, accountName, dim.name, newUsed, dim.limit, dim.threshold, siteName)
+		s.sendQuotaAlertEmails(adminEmails, accountName, dim.name, newUsed, dim.limit, effectiveThreshold, siteName)
 	}()
 }
 
@@ -149,6 +166,15 @@ func (s *BalanceNotifyService) getBalanceNotifyConfig(ctx context.Context) (enab
 	return
 }
 
+// isAccountQuotaNotifyEnabled checks the global account quota notification toggle.
+func (s *BalanceNotifyService) isAccountQuotaNotifyEnabled(ctx context.Context) bool {
+	val, err := s.settingRepo.GetValue(ctx, SettingKeyAccountQuotaNotifyEnabled)
+	if err != nil {
+		return false
+	}
+	return val == "true"
+}
+
 // getAccountQuotaNotifyEmails reads admin notification emails from settings.
 func (s *BalanceNotifyService) getAccountQuotaNotifyEmails(ctx context.Context) []string {
 	raw, err := s.settingRepo.GetValue(ctx, SettingKeyAccountQuotaNotifyEmails)
diff --git a/backend/internal/service/domain_constants.go b/backend/internal/service/domain_constants.go
index 2704e0d0..f07ddfd4 100644
--- a/backend/internal/service/domain_constants.go
+++ b/backend/internal/service/domain_constants.go
@@ -255,7 +255,8 @@ const (
 	SettingKeyBalanceLowNotifyThreshold = "balance_low_notify_threshold" // 默认阈值（USD）
 
 	// Account Quota Notification
-	SettingKeyAccountQuotaNotifyEmails = "account_quota_notify_emails" // 管理员通知邮箱列表（JSON 数组）
+	SettingKeyAccountQuotaNotifyEnabled = "account_quota_notify_enabled" // 全局开关
+	SettingKeyAccountQuotaNotifyEmails  = "account_quota_notify_emails"  // 管理员通知邮箱列表（JSON 数组）
 )
 
 // AdminAPIKeyPrefix is the prefix for admin API keys (distinct from user "sk-" keys).
diff --git a/backend/internal/service/setting_service.go b/backend/internal/service/setting_service.go
index f0cf750a..abcae9c1 100644
--- a/backend/internal/service/setting_service.go
+++ b/backend/internal/service/setting_service.go
@@ -182,6 +182,8 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		SettingPaymentEnabled,
 		SettingKeyOIDCConnectEnabled,
 		SettingKeyOIDCConnectProviderName,
+		SettingKeyBalanceLowNotifyEnabled,
+		SettingKeyAccountQuotaNotifyEnabled,
 	}
 
 	settings, err := s.settingRepo.GetMultiple(ctx, keys)
@@ -249,6 +251,8 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 		PaymentEnabled:                   settings[SettingPaymentEnabled] == "true",
 		OIDCOAuthEnabled:                 oidcEnabled,
 		OIDCOAuthProviderName:            oidcProviderName,
+		BalanceLowNotifyEnabled:          settings[SettingKeyBalanceLowNotifyEnabled] == "true",
+		AccountQuotaNotifyEnabled:        settings[SettingKeyAccountQuotaNotifyEnabled] == "true",
 	}, nil
 }
 
@@ -302,6 +306,8 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 		OIDCOAuthEnabled                 bool            `json:"oidc_oauth_enabled"`
 		OIDCOAuthProviderName            string          `json:"oidc_oauth_provider_name"`
 		Version                          string          `json:"version,omitempty"`
+		BalanceLowNotifyEnabled          bool            `json:"balance_low_notify_enabled"`
+		AccountQuotaNotifyEnabled        bool            `json:"account_quota_notify_enabled"`
 	}{
 		RegistrationEnabled:              settings.RegistrationEnabled,
 		EmailVerifyEnabled:               settings.EmailVerifyEnabled,
@@ -332,6 +338,8 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 		OIDCOAuthEnabled:                 settings.OIDCOAuthEnabled,
 		OIDCOAuthProviderName:            settings.OIDCOAuthProviderName,
 		Version:                          s.version,
+		BalanceLowNotifyEnabled:          settings.BalanceLowNotifyEnabled,
+		AccountQuotaNotifyEnabled:        settings.AccountQuotaNotifyEnabled,
 	}, nil
 }
 
@@ -609,6 +617,7 @@ func (s *SettingService) UpdateSettings(ctx context.Context, settings *SystemSet
 	// Balance low notification
 	updates[SettingKeyBalanceLowNotifyEnabled] = strconv.FormatBool(settings.BalanceLowNotifyEnabled)
 	updates[SettingKeyBalanceLowNotifyThreshold] = strconv.FormatFloat(settings.BalanceLowNotifyThreshold, 'f', 8, 64)
+	updates[SettingKeyAccountQuotaNotifyEnabled] = strconv.FormatBool(settings.AccountQuotaNotifyEnabled)
 	accountQuotaNotifyEmailsJSON, err := json.Marshal(settings.AccountQuotaNotifyEmails)
 	if err != nil {
 		return fmt.Errorf("marshal account quota notify emails: %w", err)
@@ -1251,7 +1260,8 @@ func (s *SettingService) parseSettings(settings map[string]string) *SystemSettin
 		result.BalanceLowNotifyThreshold = v
 	}
 
-	// Account quota notification emails
+	// Account quota notification
+	result.AccountQuotaNotifyEnabled = settings[SettingKeyAccountQuotaNotifyEnabled] == "true"
 	if raw := strings.TrimSpace(settings[SettingKeyAccountQuotaNotifyEmails]); raw != "" {
 		var emails []string
 		if err := json.Unmarshal([]byte(raw), &emails); err == nil {
diff --git a/backend/internal/service/settings_view.go b/backend/internal/service/settings_view.go
index debc2b19..b79b930a 100644
--- a/backend/internal/service/settings_view.go
+++ b/backend/internal/service/settings_view.go
@@ -112,7 +112,8 @@ type SystemSettings struct {
 	BalanceLowNotifyThreshold float64
 
 	// Account quota notification
-	AccountQuotaNotifyEmails []string
+	AccountQuotaNotifyEnabled bool
+	AccountQuotaNotifyEmails  []string
 }
 
 type DefaultSubscriptionSetting struct {
@@ -152,6 +153,9 @@ type PublicSettings struct {
 	OIDCOAuthEnabled      bool
 	OIDCOAuthProviderName string
 	Version               string
+
+	BalanceLowNotifyEnabled    bool
+	AccountQuotaNotifyEnabled  bool
 }
 
 // StreamTimeoutSettings 流超时处理配置（仅控制超时后的处理方式，超时判定由网关配置控制）
diff --git a/frontend/src/api/admin/settings.ts b/frontend/src/api/admin/settings.ts
index 31284289..5c5de2d1 100644
--- a/frontend/src/api/admin/settings.ts
+++ b/frontend/src/api/admin/settings.ts
@@ -138,6 +138,7 @@ export interface SystemSettings {
   // Balance & quota notification
   balance_low_notify_enabled: boolean
   balance_low_notify_threshold: number
+  account_quota_notify_enabled: boolean
   account_quota_notify_emails: string[]
 }
 
@@ -241,6 +242,7 @@ export interface UpdateSettingsRequest {
   // Balance & quota notification
   balance_low_notify_enabled?: boolean
   balance_low_notify_threshold?: number
+  account_quota_notify_enabled?: boolean
   account_quota_notify_emails?: string[]
 }
 
diff --git a/frontend/src/components/account/EditAccountModal.vue b/frontend/src/components/account/EditAccountModal.vue
index 086575e6..abb9569e 100644
--- a/frontend/src/components/account/EditAccountModal.vue
+++ b/frontend/src/components/account/EditAccountModal.vue
@@ -1188,10 +1188,13 @@
           :resetTimezone="editResetTimezone"
           :quotaNotifyDailyEnabled="editQuotaNotifyDailyEnabled"
           :quotaNotifyDailyThreshold="editQuotaNotifyDailyThreshold"
+          :quotaNotifyDailyThresholdType="editQuotaNotifyDailyThresholdType"
           :quotaNotifyWeeklyEnabled="editQuotaNotifyWeeklyEnabled"
           :quotaNotifyWeeklyThreshold="editQuotaNotifyWeeklyThreshold"
+          :quotaNotifyWeeklyThresholdType="editQuotaNotifyWeeklyThresholdType"
           :quotaNotifyTotalEnabled="editQuotaNotifyTotalEnabled"
           :quotaNotifyTotalThreshold="editQuotaNotifyTotalThreshold"
+          :quotaNotifyTotalThresholdType="editQuotaNotifyTotalThresholdType"
           @update:totalLimit="editQuotaLimit = $event"
           @update:dailyLimit="editQuotaDailyLimit = $event"
           @update:weeklyLimit="editQuotaWeeklyLimit = $event"
@@ -1203,10 +1206,13 @@
           @update:resetTimezone="editResetTimezone = $event"
           @update:quotaNotifyDailyEnabled="editQuotaNotifyDailyEnabled = $event"
           @update:quotaNotifyDailyThreshold="editQuotaNotifyDailyThreshold = $event"
+          @update:quotaNotifyDailyThresholdType="editQuotaNotifyDailyThresholdType = $event"
           @update:quotaNotifyWeeklyEnabled="editQuotaNotifyWeeklyEnabled = $event"
           @update:quotaNotifyWeeklyThreshold="editQuotaNotifyWeeklyThreshold = $event"
+          @update:quotaNotifyWeeklyThresholdType="editQuotaNotifyWeeklyThresholdType = $event"
           @update:quotaNotifyTotalEnabled="editQuotaNotifyTotalEnabled = $event"
           @update:quotaNotifyTotalThreshold="editQuotaNotifyTotalThreshold = $event"
+          @update:quotaNotifyTotalThresholdType="editQuotaNotifyTotalThresholdType = $event"
         />
       </div>
       <!-- 配额控制 (非 Anthropic apikey/bedrock) -->
@@ -1232,10 +1238,13 @@
           :resetTimezone="editResetTimezone"
           :quotaNotifyDailyEnabled="editQuotaNotifyDailyEnabled"
           :quotaNotifyDailyThreshold="editQuotaNotifyDailyThreshold"
+          :quotaNotifyDailyThresholdType="editQuotaNotifyDailyThresholdType"
           :quotaNotifyWeeklyEnabled="editQuotaNotifyWeeklyEnabled"
           :quotaNotifyWeeklyThreshold="editQuotaNotifyWeeklyThreshold"
+          :quotaNotifyWeeklyThresholdType="editQuotaNotifyWeeklyThresholdType"
           :quotaNotifyTotalEnabled="editQuotaNotifyTotalEnabled"
           :quotaNotifyTotalThreshold="editQuotaNotifyTotalThreshold"
+          :quotaNotifyTotalThresholdType="editQuotaNotifyTotalThresholdType"
           @update:totalLimit="editQuotaLimit = $event"
           @update:dailyLimit="editQuotaDailyLimit = $event"
           @update:weeklyLimit="editQuotaWeeklyLimit = $event"
@@ -1247,10 +1256,13 @@
           @update:resetTimezone="editResetTimezone = $event"
           @update:quotaNotifyDailyEnabled="editQuotaNotifyDailyEnabled = $event"
           @update:quotaNotifyDailyThreshold="editQuotaNotifyDailyThreshold = $event"
+          @update:quotaNotifyDailyThresholdType="editQuotaNotifyDailyThresholdType = $event"
           @update:quotaNotifyWeeklyEnabled="editQuotaNotifyWeeklyEnabled = $event"
           @update:quotaNotifyWeeklyThreshold="editQuotaNotifyWeeklyThreshold = $event"
+          @update:quotaNotifyWeeklyThresholdType="editQuotaNotifyWeeklyThresholdType = $event"
           @update:quotaNotifyTotalEnabled="editQuotaNotifyTotalEnabled = $event"
           @update:quotaNotifyTotalThreshold="editQuotaNotifyTotalThreshold = $event"
+          @update:quotaNotifyTotalThresholdType="editQuotaNotifyTotalThresholdType = $event"
         />
       </div>
 
@@ -1992,10 +2004,13 @@ const editWeeklyResetHour = ref<number | null>(null)
 const editResetTimezone = ref<string | null>(null)
 const editQuotaNotifyDailyEnabled = ref<boolean | null>(null)
 const editQuotaNotifyDailyThreshold = ref<number | null>(null)
+const editQuotaNotifyDailyThresholdType = ref<string | null>(null)
 const editQuotaNotifyWeeklyEnabled = ref<boolean | null>(null)
 const editQuotaNotifyWeeklyThreshold = ref<number | null>(null)
+const editQuotaNotifyWeeklyThresholdType = ref<string | null>(null)
 const editQuotaNotifyTotalEnabled = ref<boolean | null>(null)
 const editQuotaNotifyTotalThreshold = ref<number | null>(null)
+const editQuotaNotifyTotalThresholdType = ref<string | null>(null)
 const openAIWSModeOptions = computed(() => [
   { value: OPENAI_WS_MODE_OFF, label: t('admin.accounts.openai.wsModeOff') },
   // TODO: ctx_pool 选项暂时隐藏，待测试完成后恢复
@@ -2198,10 +2213,13 @@ const syncFormFromAccount = (newAccount: Account | null) => {
     // Load quota notify config
     editQuotaNotifyDailyEnabled.value = (extra?.quota_notify_daily_enabled as boolean) ?? null
     editQuotaNotifyDailyThreshold.value = (extra?.quota_notify_daily_threshold as number) ?? null
+    editQuotaNotifyDailyThresholdType.value = (extra?.quota_notify_daily_threshold_type as string) ?? null
     editQuotaNotifyWeeklyEnabled.value = (extra?.quota_notify_weekly_enabled as boolean) ?? null
     editQuotaNotifyWeeklyThreshold.value = (extra?.quota_notify_weekly_threshold as number) ?? null
+    editQuotaNotifyWeeklyThresholdType.value = (extra?.quota_notify_weekly_threshold_type as string) ?? null
     editQuotaNotifyTotalEnabled.value = (extra?.quota_notify_total_enabled as boolean) ?? null
     editQuotaNotifyTotalThreshold.value = (extra?.quota_notify_total_threshold as number) ?? null
+    editQuotaNotifyTotalThresholdType.value = (extra?.quota_notify_total_threshold_type as string) ?? null
   } else {
     editQuotaLimit.value = null
     editQuotaDailyLimit.value = null
@@ -3262,9 +3280,11 @@ const handleSubmit = async () => {
         } else {
           delete newExtra.quota_notify_daily_threshold
         }
+        newExtra.quota_notify_daily_threshold_type = editQuotaNotifyDailyThresholdType.value || 'fixed'
       } else {
         delete newExtra.quota_notify_daily_enabled
         delete newExtra.quota_notify_daily_threshold
+        delete newExtra.quota_notify_daily_threshold_type
       }
       if (editQuotaNotifyWeeklyEnabled.value) {
         newExtra.quota_notify_weekly_enabled = true
@@ -3273,9 +3293,11 @@ const handleSubmit = async () => {
         } else {
           delete newExtra.quota_notify_weekly_threshold
         }
+        newExtra.quota_notify_weekly_threshold_type = editQuotaNotifyWeeklyThresholdType.value || 'fixed'
       } else {
         delete newExtra.quota_notify_weekly_enabled
         delete newExtra.quota_notify_weekly_threshold
+        delete newExtra.quota_notify_weekly_threshold_type
       }
       if (editQuotaNotifyTotalEnabled.value) {
         newExtra.quota_notify_total_enabled = true
@@ -3284,9 +3306,11 @@ const handleSubmit = async () => {
         } else {
           delete newExtra.quota_notify_total_threshold
         }
+        newExtra.quota_notify_total_threshold_type = editQuotaNotifyTotalThresholdType.value || 'fixed'
       } else {
         delete newExtra.quota_notify_total_enabled
         delete newExtra.quota_notify_total_threshold
+        delete newExtra.quota_notify_total_threshold_type
       }
       updatePayload.extra = newExtra
     }
diff --git a/frontend/src/components/account/QuotaLimitCard.vue b/frontend/src/components/account/QuotaLimitCard.vue
index 7c3afd23..64bdb08a 100644
--- a/frontend/src/components/account/QuotaLimitCard.vue
+++ b/frontend/src/components/account/QuotaLimitCard.vue
@@ -17,17 +17,23 @@ const props = withDefaults(defineProps<{
   resetTimezone: string | null
   quotaNotifyDailyEnabled?: boolean | null
   quotaNotifyDailyThreshold?: number | null
+  quotaNotifyDailyThresholdType?: string | null
   quotaNotifyWeeklyEnabled?: boolean | null
   quotaNotifyWeeklyThreshold?: number | null
+  quotaNotifyWeeklyThresholdType?: string | null
   quotaNotifyTotalEnabled?: boolean | null
   quotaNotifyTotalThreshold?: number | null
+  quotaNotifyTotalThresholdType?: string | null
 }>(), {
   quotaNotifyDailyEnabled: null,
   quotaNotifyDailyThreshold: null,
+  quotaNotifyDailyThresholdType: null,
   quotaNotifyWeeklyEnabled: null,
   quotaNotifyWeeklyThreshold: null,
+  quotaNotifyWeeklyThresholdType: null,
   quotaNotifyTotalEnabled: null,
   quotaNotifyTotalThreshold: null,
+  quotaNotifyTotalThresholdType: null,
 })
 
 const emit = defineEmits<{
@@ -42,10 +48,13 @@ const emit = defineEmits<{
   'update:resetTimezone': [value: string | null]
   'update:quotaNotifyDailyEnabled': [value: boolean | null]
   'update:quotaNotifyDailyThreshold': [value: number | null]
+  'update:quotaNotifyDailyThresholdType': [value: string | null]
   'update:quotaNotifyWeeklyEnabled': [value: boolean | null]
   'update:quotaNotifyWeeklyThreshold': [value: number | null]
+  'update:quotaNotifyWeeklyThresholdType': [value: string | null]
   'update:quotaNotifyTotalEnabled': [value: boolean | null]
   'update:quotaNotifyTotalThreshold': [value: number | null]
+  'update:quotaNotifyTotalThresholdType': [value: string | null]
 }>()
 
 const enabled = computed(() =>
@@ -228,8 +237,10 @@ const onWeeklyModeChange = (e: Event) => {
             v-if="dailyLimit && dailyLimit > 0"
             :enabled="props.quotaNotifyDailyEnabled"
             :threshold="props.quotaNotifyDailyThreshold"
+            :threshold-type="props.quotaNotifyDailyThresholdType"
             @update:enabled="emit('update:quotaNotifyDailyEnabled', $event)"
             @update:threshold="emit('update:quotaNotifyDailyThreshold', $event)"
+            @update:threshold-type="emit('update:quotaNotifyDailyThresholdType', $event)"
           />
         </div>
 
@@ -292,8 +303,10 @@ const onWeeklyModeChange = (e: Event) => {
             v-if="weeklyLimit && weeklyLimit > 0"
             :enabled="props.quotaNotifyWeeklyEnabled"
             :threshold="props.quotaNotifyWeeklyThreshold"
+            :threshold-type="props.quotaNotifyWeeklyThresholdType"
             @update:enabled="emit('update:quotaNotifyWeeklyEnabled', $event)"
             @update:threshold="emit('update:quotaNotifyWeeklyThreshold', $event)"
+            @update:threshold-type="emit('update:quotaNotifyWeeklyThresholdType', $event)"
           />
         </div>
 
@@ -330,8 +343,10 @@ const onWeeklyModeChange = (e: Event) => {
             v-if="totalLimit && totalLimit > 0"
             :enabled="props.quotaNotifyTotalEnabled"
             :threshold="props.quotaNotifyTotalThreshold"
+            :threshold-type="props.quotaNotifyTotalThresholdType"
             @update:enabled="emit('update:quotaNotifyTotalEnabled', $event)"
             @update:threshold="emit('update:quotaNotifyTotalThreshold', $event)"
+            @update:threshold-type="emit('update:quotaNotifyTotalThresholdType', $event)"
           />
         </div>
       </div>
diff --git a/frontend/src/components/account/QuotaNotifyToggle.vue b/frontend/src/components/account/QuotaNotifyToggle.vue
index 4634f5b1..b1c22fe2 100644
--- a/frontend/src/components/account/QuotaNotifyToggle.vue
+++ b/frontend/src/components/account/QuotaNotifyToggle.vue
@@ -6,12 +6,18 @@ const { t } = useI18n()
 defineProps<{
   enabled: boolean | null
   threshold: number | null
+  thresholdType: string | null // "fixed" (default) or "percentage"
 }>()
 
 const emit = defineEmits<{
   'update:enabled': [value: boolean | null]
   'update:threshold': [value: number | null]
+  'update:thresholdType': [value: string | null]
 }>()
+
+function toggleType(current: string | null) {
+  emit('update:thresholdType', current === 'percentage' ? 'fixed' : 'percentage')
+}
 </script>
 
 <template>
@@ -32,15 +38,32 @@ const emit = defineEmits<{
         ]"
       />
     </button>
-    <div v-if="enabled" class="relative flex-1">
-      <span class="absolute left-2 top-1/2 -translate-y-1/2 text-gray-400 text-sm">$</span>
+    <div v-if="enabled" class="flex items-center gap-1 flex-1">
+      <button
+        type="button"
+        class="px-1.5 py-0.5 text-xs font-medium rounded border transition-colors"
+        :class="(!thresholdType || thresholdType === 'fixed') ? 'bg-primary-100 text-primary-700 border-primary-300 dark:bg-primary-900/30 dark:text-primary-400 dark:border-primary-700' : 'bg-gray-100 text-gray-500 border-gray-200 dark:bg-dark-600 dark:text-gray-400 dark:border-dark-500'"
+        @click="toggleType(thresholdType)"
+      >
+        $
+      </button>
+      <button
+        type="button"
+        class="px-1.5 py-0.5 text-xs font-medium rounded border transition-colors"
+        :class="thresholdType === 'percentage' ? 'bg-primary-100 text-primary-700 border-primary-300 dark:bg-primary-900/30 dark:text-primary-400 dark:border-primary-700' : 'bg-gray-100 text-gray-500 border-gray-200 dark:bg-dark-600 dark:text-gray-400 dark:border-dark-500'"
+        @click="toggleType(thresholdType)"
+      >
+        %
+      </button>
       <input
         :value="threshold"
         @input="emit('update:threshold', parseFloat(($event.target as HTMLInputElement).value) || null)"
         type="number"
         min="0"
-        step="0.01"
-        class="input pl-6 py-1 text-sm"
+        :max="thresholdType === 'percentage' ? 100 : undefined"
+        :step="thresholdType === 'percentage' ? 1 : 0.01"
+        class="input py-1 text-sm flex-1"
+        :placeholder="thresholdType === 'percentage' ? t('admin.accounts.quotaNotify.thresholdPlaceholder') : t('admin.accounts.quotaNotify.threshold')"
       />
     </div>
   </div>
diff --git a/frontend/src/i18n/locales/en.ts b/frontend/src/i18n/locales/en.ts
index 8e10bf2a..6688c1b6 100644
--- a/frontend/src/i18n/locales/en.ts
+++ b/frontend/src/i18n/locales/en.ts
@@ -2257,7 +2257,7 @@ export default {
         alert: 'Alert Threshold',
         enabled: 'Enable Alert',
         threshold: 'Alert Amount',
-        thresholdPlaceholder: 'Enter alert amount',
+        thresholdPlaceholder: 'Enter percentage',
       },
       testConnection: 'Test Connection',
       reAuthorize: 'Re-Authorize',
@@ -4640,6 +4640,7 @@ export default {
       quotaNotify: {
         title: 'Account Quota Notification',
         description: 'Notify admins when account quota usage reaches alert threshold',
+        enabled: 'Enable Account Quota Notification',
         emails: 'Notification Emails',
         emailsHint: 'Leave empty to disable notifications',
         addEmail: 'Add Email',
diff --git a/frontend/src/i18n/locales/zh.ts b/frontend/src/i18n/locales/zh.ts
index 1b82f419..70d20cc0 100644
--- a/frontend/src/i18n/locales/zh.ts
+++ b/frontend/src/i18n/locales/zh.ts
@@ -2255,7 +2255,7 @@ export default {
         alert: '告警阈值',
         enabled: '启用告警',
         threshold: '告警金额',
-        thresholdPlaceholder: '输入告警金额',
+        thresholdPlaceholder: '输入百分比',
       },
       testConnection: '测试连接',
       reAuthorize: '重新授权',
@@ -4804,6 +4804,7 @@ export default {
       quotaNotify: {
         title: '账号限额通知',
         description: '当账号配额用量达到告警阈值时通知管理员',
+        enabled: '启用账号限额通知',
         emails: '通知邮箱',
         emailsHint: '留空则不发送通知',
         addEmail: '添加邮箱',
diff --git a/frontend/src/stores/app.ts b/frontend/src/stores/app.ts
index 09e73621..b69c3648 100644
--- a/frontend/src/stores/app.ts
+++ b/frontend/src/stores/app.ts
@@ -339,7 +339,9 @@ export const useAppStore = defineStore('app', () => {
         oidc_oauth_enabled: false,
         oidc_oauth_provider_name: 'OIDC',
         backend_mode_enabled: false,
-        version: siteVersion.value
+        version: siteVersion.value,
+        balance_low_notify_enabled: false,
+        account_quota_notify_enabled: false,
       }
     }
 
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index e74f6e61..c6c74354 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -117,6 +117,8 @@ export interface PublicSettings {
   oidc_oauth_provider_name: string
   backend_mode_enabled: boolean
   version: string
+  balance_low_notify_enabled: boolean
+  account_quota_notify_enabled: boolean
 }
 
 export interface AuthResponse {
diff --git a/frontend/src/views/admin/SettingsView.vue b/frontend/src/views/admin/SettingsView.vue
index b5181ccc..222d1dd7 100644
--- a/frontend/src/views/admin/SettingsView.vue
+++ b/frontend/src/views/admin/SettingsView.vue
@@ -2718,11 +2718,15 @@
             </p>
           </div>
           <div class="px-6 py-6 space-y-4">
-            <div>
+            <div class="flex items-center justify-between">
+              <label class="mb-0 block text-sm font-medium text-gray-700 dark:text-gray-300">{{ t('admin.settings.quotaNotify.enabled') }}</label>
+              <Toggle v-model="form.account_quota_notify_enabled" />
+            </div>
+            <div v-if="form.account_quota_notify_enabled">
               <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">{{ t('admin.settings.quotaNotify.emails') }}</label>
               <div class="space-y-2">
                 <div v-for="(_, index) in (form.account_quota_notify_emails || [])" :key="index" class="flex items-center gap-2">
-                  <input v-model="form.account_quota_notify_emails[index]" type="email" class="input flex-1" />
+                  <input v-model="form.account_quota_notify_emails[index]" type="email" class="input flex-1" :placeholder="t('admin.settings.quotaNotify.emailPlaceholder')" />
                   <button @click="form.account_quota_notify_emails.splice(index, 1)" class="btn btn-secondary px-2" type="button">
                     <Icon name="x" size="xs" class="h-4 w-4" />
                   </button>
@@ -3018,6 +3022,7 @@ const form = reactive<SettingsForm>({
   // Balance & quota notification
   balance_low_notify_enabled: false,
   balance_low_notify_threshold: 0,
+  account_quota_notify_enabled: false,
   account_quota_notify_emails: [] as string[]
 })
 
@@ -3588,6 +3593,7 @@ async function saveSettings() {
       // Balance & quota notification
       balance_low_notify_enabled: form.balance_low_notify_enabled,
       balance_low_notify_threshold: Number(form.balance_low_notify_threshold) || 0,
+      account_quota_notify_enabled: form.account_quota_notify_enabled,
       account_quota_notify_emails: (form.account_quota_notify_emails || []).filter((e: string) => e.trim() !== ''),
     }
 
diff --git a/frontend/src/views/user/ProfileView.vue b/frontend/src/views/user/ProfileView.vue
index 5534e1d6..f801e20d 100644
--- a/frontend/src/views/user/ProfileView.vue
+++ b/frontend/src/views/user/ProfileView.vue
@@ -15,7 +15,7 @@
       </div>
       <ProfileEditForm :initial-username="user?.username || ''" />
       <ProfileBalanceNotifyCard
-        v-if="user"
+        v-if="user && balanceLowNotifyEnabled"
         :enabled="user.balance_notify_enabled ?? true"
         :threshold="user.balance_notify_threshold"
         :extra-emails="user.balance_notify_extra_emails ?? []"
@@ -40,11 +40,12 @@ import { Icon } from '@/components/icons'
 
 const { t } = useI18n(); const authStore = useAuthStore(); const user = computed(() => authStore.user)
 const contactInfo = ref('')
+const balanceLowNotifyEnabled = ref(false)
 
 const WalletIcon = { render: () => h('svg', { fill: 'none', viewBox: '0 0 24 24', stroke: 'currentColor', 'stroke-width': '1.5' }, [h('path', { d: 'M21 12a2.25 2.25 0 00-2.25-2.25H15a3 3 0 11-6 0H5.25A2.25 2.25 0 003 12' })]) }
 const BoltIcon = { render: () => h('svg', { fill: 'none', viewBox: '0 0 24 24', stroke: 'currentColor', 'stroke-width': '1.5' }, [h('path', { d: 'm3.75 13.5 10.5-11.25L12 10.5h8.25L9.75 21.75 12 13.5H3.75z' })]) }
 const CalendarIcon = { render: () => h('svg', { fill: 'none', viewBox: '0 0 24 24', stroke: 'currentColor', 'stroke-width': '1.5' }, [h('path', { d: 'M6.75 3v2.25M17.25 3v2.25' })]) }
 
-onMounted(async () => { try { const s = await authAPI.getPublicSettings(); contactInfo.value = s.contact_info || '' } catch (error) { console.error('Failed to load contact info:', error) } })
+onMounted(async () => { try { const s = await authAPI.getPublicSettings(); contactInfo.value = s.contact_info || ''; balanceLowNotifyEnabled.value = s.balance_low_notify_enabled ?? false } catch (error) { console.error('Failed to load contact info:', error) } })
 const formatCurrency = (v: number) => `$${v.toFixed(2)}`
 </script>
\ No newline at end of file