diff --git a/backend/internal/service/account_test_service.go b/backend/internal/service/account_test_service.go
index 3290fe52..ee7b69a2 100644
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -245,17 +245,19 @@ func (s *AccountTestService) testClaudeAccountConnection(c *gin.Context, account
 	// Set common headers
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("anthropic-version", "2023-06-01")
-	req.Header.Set("anthropic-beta", claude.DefaultBetaHeader)
 
-	// Apply Claude Code client headers
-	for key, value := range claude.DefaultHeaders {
-		req.Header.Set(key, value)
-	}
-
-	// Set authentication header
+	// Set authentication header and beta header based on account type
 	if useBearer {
+		// OAuth 账号使用完整的 Claude Code beta header
+		req.Header.Set("anthropic-beta", claude.DefaultBetaHeader)
 		req.Header.Set("Authorization", "Bearer "+authToken)
+		// Apply Claude Code client headers for OAuth
+		for key, value := range claude.DefaultHeaders {
+			req.Header.Set(key, value)
+		}
 	} else {
+		// API Key 账号使用简化的 beta header（不含 oauth）
+		req.Header.Set("anthropic-beta", claude.APIKeyBetaHeader)
 		req.Header.Set("x-api-key", authToken)
 	}