diff --git a/lib/ai/providers/alibaba-image.ts b/lib/ai/providers/alibaba-image.ts
index 4b2c6e9..24ecf2d 100644
--- a/lib/ai/providers/alibaba-image.ts
+++ b/lib/ai/providers/alibaba-image.ts
@@ -333,14 +333,17 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
                 } else {
                   imageUrls.push(imageUrl);
                 }
-              } else if (part.type === "file" && (part as any).url) {
-                // 格式3: { type: "file", url: string } - 来自 ChatMessage 的原始格式
-                const fileUrl = (part as any).url;
-                if (fileUrl.startsWith("data:")) {
-                  const url = await uploadBase64ToS3(fileUrl);
-                  imageUrls.push(url);
-                } else {
-                  imageUrls.push(fileUrl);
+              } else if (part.type === "file") {
+                // 格式3: { type: "file", url/data: string } - 来自 ChatMessage 的原始格式
+                // AI SDK convertToModelMessages 会将 url 转换为 data 字段
+                const fileUrl = (part as any).url || (part as any).data;
+                if (fileUrl) {
+                  if (fileUrl.startsWith("data:")) {
+                    const url = await uploadBase64ToS3(fileUrl);
+                    imageUrls.push(url);
+                  } else {
+                    imageUrls.push(fileUrl);
+                  }
                 }
               }
             }