diff --git a/app/(admin)/settings/admin-settings-client.tsx b/app/(admin)/settings/admin-settings-client.tsx
index 7a29d1a..86617c5 100644
--- a/app/(admin)/settings/admin-settings-client.tsx
+++ b/app/(admin)/settings/admin-settings-client.tsx
@@ -352,7 +352,7 @@ export function AdminSettingsClient() {
     apiUrl: "",
     apiKey: "",
     type: "clean", // "clean" | "face"
-    scaleFactor: "", // "" | "1" | "2" | "4"
+    scaleFactor: "auto", // "auto" | "1" | "2" | "4"
   });
 
   // 加载抠图API配置
@@ -381,7 +381,7 @@ export function AdminSettingsClient() {
         apiUrl: config.apiUrl || "",
         apiKey: config.apiKey || "",
         type: config.type || "clean",
-        scaleFactor: config.scaleFactor ? String(config.scaleFactor) : "",
+        scaleFactor: config.scaleFactor ? String(config.scaleFactor) : "auto",
       });
     }
   }, [enhanceConfigData]);
@@ -715,7 +715,7 @@ export function AdminSettingsClient() {
             apiUrl: enhanceConfig.apiUrl.trim(),
             apiKey: enhanceConfig.apiKey.trim(),
             type: enhanceConfig.type,
-            scaleFactor: enhanceConfig.scaleFactor ? Number.parseInt(enhanceConfig.scaleFactor) : undefined,
+            scaleFactor: enhanceConfig.scaleFactor && enhanceConfig.scaleFactor !== "auto" ? Number.parseInt(enhanceConfig.scaleFactor) : undefined,
           },
         }),
       });
@@ -3075,7 +3075,7 @@ export function AdminSettingsClient() {
                     <SelectValue placeholder="自动缩放" />
                   </SelectTrigger>
                   <SelectContent>
-                    <SelectItem value="">自动缩放</SelectItem>
+                    <SelectItem value="auto">自动缩放</SelectItem>
                     <SelectItem value="1">不放大</SelectItem>
                     <SelectItem value="2">2倍放大</SelectItem>
                     <SelectItem value="4">4倍放大</SelectItem>