diff --git a/crypto_monitor_binance/app.py b/crypto_monitor_binance/app.py
index e39769a..f8cd21d 100644
--- a/crypto_monitor_binance/app.py
+++ b/crypto_monitor_binance/app.py
@@ -411,7 +411,7 @@ _APP_STARTED_AT = time.time()
 _RECONCILE_FLAT_STREAK = {}
 KLINE_TIMEFRAME = os.getenv("KLINE_TIMEFRAME", "5m")
 FULL_MARGIN_BUFFER_RATIO = float(os.getenv("FULL_MARGIN_BUFFER_RATIO", "0.98"))
-TRANSFER_CCY = os.getenv("TRANSFER_CCY", "USDT")
+TRANSFER_CCY = (os.getenv("TRANSFER_CCY", "USDT") or "USDT").strip().upper() or "USDT"
 UPLOAD_FOLDER = resolve_path(os.getenv("UPLOAD_DIR", "static/images"))
 ORDER_CHART_ENABLED = os.getenv("ORDER_CHART_ENABLED", "true").lower() == "true"
 ORDER_CHART_TFS = [x.strip() for x in (os.getenv("ORDER_CHART_TFS", "4h,1h,15m,5m") or "").split(",") if x.strip()]
diff --git a/crypto_monitor_gate/app.py b/crypto_monitor_gate/app.py
index dfb48ad..9ca6eaa 100644
--- a/crypto_monitor_gate/app.py
+++ b/crypto_monitor_gate/app.py
@@ -404,7 +404,7 @@ KLINE_TIMEFRAME = os.getenv("KLINE_TIMEFRAME", "5m")
 _APP_STARTED_AT = time.time()
 _RECONCILE_FLAT_STREAK = {}
 FULL_MARGIN_BUFFER_RATIO = float(os.getenv("FULL_MARGIN_BUFFER_RATIO", "0.98"))
-TRANSFER_CCY = os.getenv("TRANSFER_CCY", "USDT")
+TRANSFER_CCY = (os.getenv("TRANSFER_CCY", "USDT") or "USDT").strip().upper() or "USDT"
 UPLOAD_FOLDER = resolve_path(os.getenv("UPLOAD_DIR", "static/images"))
 ORDER_CHART_ENABLED = os.getenv("ORDER_CHART_ENABLED", "true").lower() == "true"
 ORDER_CHART_TFS = [x.strip() for x in (os.getenv("ORDER_CHART_TFS", "4h,1h,15m,5m") or "").split(",") if x.strip()]
diff --git a/crypto_monitor_okx/app.py b/crypto_monitor_okx/app.py
index 217d6be..799181c 100644
--- a/crypto_monitor_okx/app.py
+++ b/crypto_monitor_okx/app.py
@@ -384,7 +384,7 @@ BREAKEVEN_EXCHANGE_MIN_INTERVAL_SEC = max(
 _BREAKEVEN_LAST_EX_SYNC: dict[int, float] = {}
 KLINE_TIMEFRAME = os.getenv("KLINE_TIMEFRAME", "5m")
 FULL_MARGIN_BUFFER_RATIO = float(os.getenv("FULL_MARGIN_BUFFER_RATIO", "0.98"))
-TRANSFER_CCY = os.getenv("TRANSFER_CCY", "USDT")
+TRANSFER_CCY = (os.getenv("TRANSFER_CCY", "USDT") or "USDT").strip().upper() or "USDT"
 OKX_POSITION_INST_TYPE = os.getenv("OKX_POSITION_INST_TYPE", "SWAP")
 EXCHANGE_POSITION_SYNC_FROM_BJ = (os.getenv("EXCHANGE_POSITION_SYNC_FROM_BJ") or "").strip()
 EXCHANGE_POSITION_HISTORY_LIMIT = max(50, min(1000, int(os.getenv("EXCHANGE_POSITION_HISTORY_LIMIT", "200"))))
diff --git a/lib/exchange/gate_transfer_lib.py b/lib/exchange/gate_transfer_lib.py
index 2adcb46..fd0b257 100644
--- a/lib/exchange/gate_transfer_lib.py
+++ b/lib/exchange/gate_transfer_lib.py
@@ -22,6 +22,7 @@ def execute_transfer_usdt(
 ) -> tuple[bool, str, Any]:
     if amount <= 0:
         return False, "划转金额必须大于0", None
+    ccy = (transfer_ccy or "USDT").strip().upper() or "USDT"
     ok_live, reason = ensure_live_ready()
     if not ok_live:
         return False, reason, None
@@ -31,7 +32,7 @@ def execute_transfer_usdt(
         except Exception:
             pass
     try:
-        resp = exchange.transfer(transfer_ccy, float(amount), from_account, to_account)
+        resp = exchange.transfer(ccy, float(amount), from_account, to_account)
         return True, "划转成功", resp
     except Exception as e:
         msg = str(e)