diff --git a/components/image-preview.tsx b/components/image-preview.tsx
index aa5e714..1269148 100644
--- a/components/image-preview.tsx
+++ b/components/image-preview.tsx
@@ -105,8 +105,24 @@ export function ImagePreview({
       } else if (src.includes("openai-thumb-")) {
         originalUrl = src.replace("openai-thumb-", "openai-orig-");
         console.log("[ImagePreview] Inferred original URL from openai-thumb filename");
+      } else if (src.includes("/thumb/") || src.includes("-thumb")) {
+        // 尝试从S3 URL中推断原图URL（常见格式：xxx-thumb.jpg -> xxx.jpg 或 xxx/thumb/xxx -> xxx/xxx）
+        originalUrl = src.replace(/-thumb\./g, ".").replace(/\/thumb\//g, "/");
+        console.log("[ImagePreview] Inferred original URL from S3 path pattern");
       } else {
-        console.log("[ImagePreview] ⚠️ Could not parse original URL, using thumbnail as fallback");
+        // 如果无法推断，且src看起来已经是完整的URL（不是缩略图），直接使用src作为原图
+        // 否则记录警告
+        if (src.startsWith("http://") || src.startsWith("https://")) {
+          // 如果src已经是完整URL且不包含thumb标识，可能是原图
+          if (!src.includes("thumb") && !src.includes("thumbnail")) {
+            originalUrl = src;
+            console.log("[ImagePreview] Using src as original URL (no thumb identifier found)");
+          } else {
+            console.log("[ImagePreview] ⚠️ Could not parse original URL, using thumbnail as fallback");
+          }
+        } else {
+          console.log("[ImagePreview] ⚠️ Could not parse original URL, using thumbnail as fallback");
+        }
       }
     }