diff --git a/app/core/wechat.py b/app/core/wechat.py
index 225a5f4..5298ddb 100644
--- a/app/core/wechat.py
+++ b/app/core/wechat.py
@@ -279,7 +279,7 @@ class WeChatClient:
             
             # Base64解码密文和随机串
             ciphertext_bytes = base64.b64decode(ciphertext)
-            nonce_bytes = base64.b64decode(nonce)
+            nonce_bytes = nonce.encode('utf-8')  # nonce 不需要 base64 解码
             
             # 处理附加数据
             associated_data_bytes = associated_data.encode('utf-8') if associated_data else b''
@@ -291,6 +291,9 @@ class WeChatClient:
             print(f"Nonce长度: {len(nonce_bytes)} bytes")
             print(f"密文长度: {len(ciphertext_bytes)} bytes")
             print(f"附加数据: {associated_data_bytes}")
+            print(f"使用的密钥: {self.api_v3_key}")  # 仅用于调试，生产环境需要移除
+            print(f"原始nonce: {nonce}")
+            print(f"原始associated_data: {associated_data}")
             
             # 解密数据
             decrypted_data = aesgcm.decrypt(