diff --git a/app/api/rmbg/route.ts b/app/api/rmbg/route.ts
index 840c6b8c8..42ffe549c 100644
--- a/app/api/rmbg/route.ts
+++ b/app/api/rmbg/route.ts
@@ -309,6 +309,12 @@ async function processWithAosSegmentation(
 
       const state = Number(pollPayload.data.state);
       const imageUrl = pollPayload.data.image as string | undefined;
+      const stateDetail = String(pollPayload.data.state_detail || "");
+      const errMessage = String(pollPayload.data.err_message || pollPayload.data.err_info || "");
+
+      if (pollCount === 0 || pollCount % 5 === 0) {
+        console.log(`[AOS RMBG] poll=${pollCount + 1} state=${state} detail=${stateDetail}`);
+      }
 
       if (state === 1 && imageUrl) {
         const imageResponse = await withTimeout(
@@ -335,10 +341,11 @@ async function processWithAosSegmentation(
         };
       }
 
-      if (state === 2 || state === 3 || state === -1) {
+      // AOS: state=2(Preparing) 属于处理中，不能当失败；只有负数状态视为失败
+      if (state < 0) {
         return {
           success: false,
-          error: `AOS任务失败: ${pollPayload?.message || "状态异常"}`,
+          error: `AOS任务失败: ${errMessage || stateDetail || pollPayload?.message || "状态异常"}`,
         };
       }
     }