diff --git a/backend/internal/handler/admin/account_handler.go b/backend/internal/handler/admin/account_handler.go
index 188aa0ec..bbf5d026 100644
--- a/backend/internal/handler/admin/account_handler.go
+++ b/backend/internal/handler/admin/account_handler.go
@@ -547,9 +547,18 @@ func (h *AccountHandler) Refresh(c *gin.Context) {
 			}
 		}
 
-		// 如果 project_id 获取失败，先更新凭证，再标记账户为 error
+		// 特殊处理 project_id：如果新值为空但旧值非空，保留旧值
+		// 这确保了即使 LoadCodeAssist 失败，project_id 也不会丢失
+		if newProjectID, _ := newCredentials["project_id"].(string); newProjectID == "" {
+			if oldProjectID := strings.TrimSpace(account.GetCredential("project_id")); oldProjectID != "" {
+				newCredentials["project_id"] = oldProjectID
+			}
+		}
+
+		// 如果 project_id 获取失败，更新凭证但不标记为 error
+		// LoadCodeAssist 失败可能是临时网络问题，给它机会在下次自动刷新时重试
 		if tokenInfo.ProjectIDMissing {
-			// 先更新凭证
+			// 先更新凭证（token 本身刷新成功了）
 			_, updateErr := h.adminService.UpdateAccount(c.Request.Context(), accountID, &service.UpdateAccountInput{
 				Credentials: newCredentials,
 			})
@@ -557,14 +566,10 @@ func (h *AccountHandler) Refresh(c *gin.Context) {
 				response.InternalError(c, "Failed to update credentials: "+updateErr.Error())
 				return
 			}
-			// 标记账户为 error
-			if setErr := h.adminService.SetAccountError(c.Request.Context(), accountID, "missing_project_id: 账户缺少project id，可能无法使用Antigravity"); setErr != nil {
-				response.InternalError(c, "Failed to set account error: "+setErr.Error())
-				return
-			}
+			// 不标记为 error，只返回警告信息
 			response.Success(c, gin.H{
-				"message": "Token refreshed but project_id is missing, account marked as error",
-				"warning": "missing_project_id",
+				"message": "Token refreshed successfully, but project_id could not be retrieved (will retry automatically)",
+				"warning": "missing_project_id_temporary",
 			})
 			return
 		}
diff --git a/backend/internal/service/antigravity_oauth_service.go b/backend/internal/service/antigravity_oauth_service.go
index 3850fa57..fa8379ed 100644
--- a/backend/internal/service/antigravity_oauth_service.go
+++ b/backend/internal/service/antigravity_oauth_service.go
@@ -142,12 +142,13 @@ func (s *AntigravityOAuthService) ExchangeCode(ctx context.Context, input *Antig
 		result.Email = userInfo.Email
 	}
 
-	// 获取 project_id（部分账户类型可能没有）
-	loadResp, _, err := client.LoadCodeAssist(ctx, tokenResp.AccessToken)
-	if err != nil {
-		fmt.Printf("[AntigravityOAuth] 警告: 获取 project_id 失败: %v\n", err)
-	} else if loadResp != nil && loadResp.CloudAICompanionProject != "" {
-		result.ProjectID = loadResp.CloudAICompanionProject
+	// 获取 project_id（部分账户类型可能没有），失败时重试
+	projectID, loadErr := s.loadProjectIDWithRetry(ctx, tokenResp.AccessToken, proxyURL, 3)
+	if loadErr != nil {
+		fmt.Printf("[AntigravityOAuth] 警告: 获取 project_id 失败（重试后）: %v\n", loadErr)
+		result.ProjectIDMissing = true
+	} else {
+		result.ProjectID = projectID
 	}
 
 	return result, nil
diff --git a/backend/internal/service/antigravity_token_refresher.go b/backend/internal/service/antigravity_token_refresher.go
index 2beb9e84..e33f88d0 100644
--- a/backend/internal/service/antigravity_token_refresher.go
+++ b/backend/internal/service/antigravity_token_refresher.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"strings"
 	"time"
 )
 
@@ -56,22 +57,31 @@ func (r *AntigravityTokenRefresher) Refresh(ctx context.Context, account *Accoun
 	}
 
 	newCredentials := r.antigravityOAuthService.BuildAccountCredentials(tokenInfo)
+	// 合并旧的 credentials，保留新 credentials 中不存在的字段
 	for k, v := range account.Credentials {
 		if _, exists := newCredentials[k]; !exists {
 			newCredentials[k] = v
 		}
 	}
 
-	// 如果 project_id 获取失败但之前有 project_id，不返回错误（只是临时网络故障）
-	// 只有真正缺失 project_id（从未获取过）时才返回错误
+	// 特殊处理 project_id：如果新值为空但旧值非空，保留旧值
+	// 这确保了即使 LoadCodeAssist 失败，project_id 也不会丢失
+	if newProjectID, _ := newCredentials["project_id"].(string); newProjectID == "" {
+		if oldProjectID := strings.TrimSpace(account.GetCredential("project_id")); oldProjectID != "" {
+			newCredentials["project_id"] = oldProjectID
+		}
+	}
+
+	// 如果 project_id 获取失败，只记录警告，不返回错误
+	// LoadCodeAssist 失败可能是临时网络问题，应该允许重试而不是立即标记为不可重试错误
+	// Token 刷新本身是成功的（access_token 和 refresh_token 已更新）
 	if tokenInfo.ProjectIDMissing {
-		// 检查是否保留了旧的 project_id
 		if tokenInfo.ProjectID != "" {
-			// 有旧的 project_id，只是本次获取失败，记录警告但不返回错误
+			// 有旧的 project_id，本次获取失败，保留旧值
 			log.Printf("[AntigravityTokenRefresher] Account %d: LoadCodeAssist 临时失败，保留旧 project_id", account.ID)
 		} else {
-			// 真正缺失 project_id，返回错误
-			return newCredentials, fmt.Errorf("missing_project_id: 账户缺少project id，可能无法使用Antigravity")
+			// 从未获取过 project_id，本次也失败，但不返回错误以允许下次重试
+			log.Printf("[AntigravityTokenRefresher] Account %d: LoadCodeAssist 失败，project_id 缺失，但 token 已更新，将在下次刷新时重试", account.ID)
 		}
 	}