diff --git a/backend/internal/handler/admin/setting_handler.go b/backend/internal/handler/admin/setting_handler.go
index 1071879b..6666ce4e 100644
--- a/backend/internal/handler/admin/setting_handler.go
+++ b/backend/internal/handler/admin/setting_handler.go
@@ -666,7 +666,6 @@ func (h *SettingHandler) GetStreamTimeoutSettings(c *gin.Context) {
 
 	response.Success(c, dto.StreamTimeoutSettings{
 		Enabled:                settings.Enabled,
-		TimeoutSeconds:         settings.TimeoutSeconds,
 		Action:                 settings.Action,
 		TempUnschedMinutes:     settings.TempUnschedMinutes,
 		ThresholdCount:         settings.ThresholdCount,
@@ -677,7 +676,6 @@ func (h *SettingHandler) GetStreamTimeoutSettings(c *gin.Context) {
 // UpdateStreamTimeoutSettingsRequest 更新流超时配置请求
 type UpdateStreamTimeoutSettingsRequest struct {
 	Enabled                bool   `json:"enabled"`
-	TimeoutSeconds         int    `json:"timeout_seconds"`
 	Action                 string `json:"action"`
 	TempUnschedMinutes     int    `json:"temp_unsched_minutes"`
 	ThresholdCount         int    `json:"threshold_count"`
@@ -695,7 +693,6 @@ func (h *SettingHandler) UpdateStreamTimeoutSettings(c *gin.Context) {
 
 	settings := &service.StreamTimeoutSettings{
 		Enabled:                req.Enabled,
-		TimeoutSeconds:         req.TimeoutSeconds,
 		Action:                 req.Action,
 		TempUnschedMinutes:     req.TempUnschedMinutes,
 		ThresholdCount:         req.ThresholdCount,
@@ -716,7 +713,6 @@ func (h *SettingHandler) UpdateStreamTimeoutSettings(c *gin.Context) {
 
 	response.Success(c, dto.StreamTimeoutSettings{
 		Enabled:                updatedSettings.Enabled,
-		TimeoutSeconds:         updatedSettings.TimeoutSeconds,
 		Action:                 updatedSettings.Action,
 		TempUnschedMinutes:     updatedSettings.TempUnschedMinutes,
 		ThresholdCount:         updatedSettings.ThresholdCount,
diff --git a/backend/internal/handler/dto/settings.go b/backend/internal/handler/dto/settings.go
index bb498914..81206def 100644
--- a/backend/internal/handler/dto/settings.go
+++ b/backend/internal/handler/dto/settings.go
@@ -70,7 +70,6 @@ type PublicSettings struct {
 // StreamTimeoutSettings 流超时处理配置 DTO
 type StreamTimeoutSettings struct {
 	Enabled                bool   `json:"enabled"`
-	TimeoutSeconds         int    `json:"timeout_seconds"`
 	Action                 string `json:"action"`
 	TempUnschedMinutes     int    `json:"temp_unsched_minutes"`
 	ThresholdCount         int    `json:"threshold_count"`
diff --git a/backend/internal/service/setting_service.go b/backend/internal/service/setting_service.go
index 4707a854..0a7426f8 100644
--- a/backend/internal/service/setting_service.go
+++ b/backend/internal/service/setting_service.go
@@ -696,15 +696,6 @@ func (s *SettingService) GetStreamTimeoutSettings(ctx context.Context) (*StreamT
 	}
 
 	// 验证并修正配置值
-	if settings.TimeoutSeconds < 0 {
-		settings.TimeoutSeconds = 0
-	}
-	if settings.TimeoutSeconds > 0 && settings.TimeoutSeconds < 30 {
-		settings.TimeoutSeconds = 30
-	}
-	if settings.TimeoutSeconds > 300 {
-		settings.TimeoutSeconds = 300
-	}
 	if settings.TempUnschedMinutes < 1 {
 		settings.TempUnschedMinutes = 1
 	}
@@ -742,12 +733,6 @@ func (s *SettingService) SetStreamTimeoutSettings(ctx context.Context, settings
 	}
 
 	// 验证配置值
-	if settings.TimeoutSeconds < 0 {
-		return fmt.Errorf("timeout_seconds must be non-negative")
-	}
-	if settings.TimeoutSeconds > 0 && (settings.TimeoutSeconds < 30 || settings.TimeoutSeconds > 300) {
-		return fmt.Errorf("timeout_seconds must be 0 or between 30-300")
-	}
 	if settings.TempUnschedMinutes < 1 || settings.TempUnschedMinutes > 60 {
 		return fmt.Errorf("temp_unsched_minutes must be between 1-60")
 	}
diff --git a/backend/internal/service/settings_view.go b/backend/internal/service/settings_view.go
index ce5387d8..e4ee2826 100644
--- a/backend/internal/service/settings_view.go
+++ b/backend/internal/service/settings_view.go
@@ -70,12 +70,10 @@ type PublicSettings struct {
 	Version             string
 }
 
-// StreamTimeoutSettings 流超时处理配置
+// 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）
 type StreamTimeoutSettings struct {
 	// Enabled 是否启用流超时处理
 	Enabled bool `json:"enabled"`
-	// TimeoutSeconds 流数据间隔超时阈值（秒），0表示禁用
-	TimeoutSeconds int `json:"timeout_seconds"`
 	// Action 超时后的处理方式: "temp_unsched" | "error" | "none"
 	Action string `json:"action"`
 	// TempUnschedMinutes 临时不可调度持续时间（分钟）
@@ -96,8 +94,7 @@ const (
 // DefaultStreamTimeoutSettings 返回默认的流超时配置
 func DefaultStreamTimeoutSettings() *StreamTimeoutSettings {
 	return &StreamTimeoutSettings{
-		Enabled:                true,
-		TimeoutSeconds:         60,
+		Enabled:                false,
 		Action:                 StreamTimeoutActionTempUnsched,
 		TempUnschedMinutes:     5,
 		ThresholdCount:         3,
diff --git a/frontend/src/api/admin/settings.ts b/frontend/src/api/admin/settings.ts
index eb046741..fc72be8d 100644
--- a/frontend/src/api/admin/settings.ts
+++ b/frontend/src/api/admin/settings.ts
@@ -206,7 +206,6 @@ export async function deleteAdminApiKey(): Promise<{ message: string }> {
  */
 export interface StreamTimeoutSettings {
   enabled: boolean
-  timeout_seconds: number
   action: 'temp_unsched' | 'error' | 'none'
   temp_unsched_minutes: number
   threshold_count: number