diff --git a/rid_sim_windows.py b/rid_sim_windows.py
index a812e3d..0dd1579 100644
--- a/rid_sim_windows.py
+++ b/rid_sim_windows.py
@@ -75,7 +75,7 @@ class RIDPosVecPacket:
 class RIDRDPacket:
     """运行描述报文 (Message Type 0x3)"""
     description_type: int = 0   # 描述类型: 0=文字描述
-    description: str = ""       # 描述内容（最多23字节ASCII）
+    description: str = "aa"       # 描述内容（最多23字节ASCII）
 
 
 @dataclass