diff --git a/lib/utils/utils.dart b/lib/utils/utils.dart
index f0ee642bb..7828abac7 100644
--- a/lib/utils/utils.dart
+++ b/lib/utils/utils.dart
@@ -1676,7 +1676,9 @@ class Utils {
     return base64.encode(randomBytes);
   }
 
-  static String getFileName(String uri) {
-    return uri.substring(uri.lastIndexOf('/') + 1);
+  static String getFileName(String uri, {bool fileExt = true}) {
+    final i0 = uri.lastIndexOf('/') + 1;
+    final i1 = fileExt ? uri.length : uri.lastIndexOf('.');
+    return uri.substring(i0, i1);
   }
 }
diff --git a/lib/utils/wbi_sign.dart b/lib/utils/wbi_sign.dart
index 12ad3c7c5..9a8cf7b09 100644
--- a/lib/utils/wbi_sign.dart
+++ b/lib/utils/wbi_sign.dart
@@ -83,8 +83,9 @@ class WbiSign {
     if (resp.data['code'] == 0) {
       final wbiUrls = resp.data['data']['wbi_img'];
 
-      mixinKey = getMixinKey(Utils.getFileName(wbiUrls['img_url']) +
-          Utils.getFileName(wbiUrls['sub_url']));
+      mixinKey = getMixinKey(
+          Utils.getFileName(wbiUrls['img_url'], fileExt: false) +
+              Utils.getFileName(wbiUrls['sub_url'], fileExt: false));
 
       localCache.put(LocalCacheKey.mixinKey, mixinKey);
       localCache.put(LocalCacheKey.timeStamp, nowDate.millisecondsSinceEpoch);