diff --git a/trading_system/binance_client.py b/trading_system/binance_client.py
index b806581..dd25517 100644
--- a/trading_system/binance_client.py
+++ b/trading_system/binance_client.py
@@ -2037,12 +2037,22 @@ class BinanceClient:
                 ws_params["apiKey"] = self.api_key
                 if "timestamp" not in ws_params:
                     ws_params["timestamp"] = int(time.time() * 1000)
-                # 计算签名（和 REST 一样的方式）
+                # 计算签名：币安要求参与签名的值格式与 REST 一致（布尔小写、空值不参与或为空串）
                 if "signature" not in ws_params:
                     import hmac
                     import hashlib
                     from urllib.parse import urlencode
-                    query_string = urlencode(sorted([(k, str(v)) for k, v in ws_params.items() if k != "signature"]))
+                    def _param_val_for_signature(v):
+                        if v is True:
+                            return "true"
+                        if v is False:
+                            return "false"
+                        if v is None:
+                            return ""
+                        s = str(v).strip()
+                        return s if s else ""
+                    sign_params = [(k, _param_val_for_signature(v)) for k, v in ws_params.items() if k != "signature"]
+                    query_string = urlencode(sorted(sign_params))
                     signature = hmac.new(
                         self.api_secret.encode('utf-8'),
                         query_string.encode('utf-8'),