diff --git a/lib/talk/starChart/entity/scp_message.dart b/lib/talk/starChart/entity/scp_message.dart
index fc8a3141..ca5fcef3 100644
--- a/lib/talk/starChart/entity/scp_message.dart
+++ b/lib/talk/starChart/entity/scp_message.dart
@@ -68,6 +68,18 @@ class ScpMessage {
     return 'ScpMessage{ProtocolFlag: $ProtocolFlag, MessageType: $MessageType, MessageId: $MessageId, SpTotal: $SpTotal, SpIndex: $SpIndex, FromPeerId: $FromPeerId, ToPeerId: $ToPeerId, PayloadType: $PayloadType, PayloadCRC: $PayloadCRC, PayloadLength: $PayloadLength, Payload: $Payload}';
   }
 
+  // 辅助函数：定长字符串编码
+  List<int> encodeFixedLengthString(String? str, int length) {
+    final bytes = utf8.encode(str ?? '');
+    if (bytes.length > length) {
+      return bytes.sublist(0, length);
+    } else if (bytes.length < length) {
+      return bytes + List.filled(length - bytes.length, 0);
+    } else {
+      return bytes;
+    }
+  }
+
   String serialize() {
     final bytes = <int>[];
 
@@ -98,16 +110,19 @@ class ScpMessage {
     if (SpIndex != null) {
       bytes.add(SpIndex!);
     }
-
-    // FromPeerId (字符串，记录长度)
+    // FromPeerId (字符串，长度固定为44字节)
     if (FromPeerId != null) {
       bytes.addAll(utf8.encode(FromPeerId!));
     }
+    // FromPeerId (44字节定长)
+    // bytes.addAll(encodeFixedLengthString(FromPeerId, 44));
 
-    // ToPeerId (字符串，假设长度固定为32字节)
+    // ToPeerId (字符串，长度固定为44字节)
     if (ToPeerId != null) {
       bytes.addAll(utf8.encode(ToPeerId!));
     }
+    // ToPeerId (44字节定长)
+    // bytes.addAll(encodeFixedLengthString(ToPeerId, 44));
 
     // PayloadType (2 bytes)
     if (PayloadType != null) {