diff --git a/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java b/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
index b4526e5..8f00151 100644
--- a/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
+++ b/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
@@ -585,7 +585,7 @@ public class AutoGridStrategy extends BaseStrategy {
 
         String clientOrderId = buildClientOrderId("BUY", normalizedPrice);
         try {
-            JSONObject orderInfo = buildOrderRequest("buy", "open", "limit", normalizedPrice, baseQuantity, false);
+            JSONObject orderInfo = buildOrderRequest("buy", "open", "limit", normalizedPrice, baseQuantity);
             orderInfo.put("clientOid", clientOrderId);
 
             JSONObject result = bitGetClient.placeOrder(orderInfo);
@@ -633,8 +633,8 @@ public class AutoGridStrategy extends BaseStrategy {
 
         String clientOrderId = buildClientOrderId("SELL", position.entryPrice);
         try {
-            JSONObject orderInfo = buildOrderRequest("sell", "close", "limit", sellPrice,
-                    position.quantity, true);
+            JSONObject orderInfo = buildOrderRequest("buy", "close", "limit", sellPrice,
+                    position.quantity);
             orderInfo.put("clientOid", clientOrderId);
 
             JSONObject result = bitGetClient.placeOrder(orderInfo);
@@ -694,7 +694,7 @@ public class AutoGridStrategy extends BaseStrategy {
 
         if (isOpenBuy(side, tradeSide)) {
             onBuyFilled(price, volume, orderId, clientOid, price);
-        } else if (isCloseSell(side, tradeSide)) {
+        } else if (isCloseBuy(side, tradeSide)) {
             onSellFilled(price, volume, orderId, clientOid);
         }
     }
@@ -717,9 +717,9 @@ public class AutoGridStrategy extends BaseStrategy {
         BigDecimal orderPrice = order.getBigDecimal("price");
 
         if ("cancelled".equals(status) || "canceled".equals(status)) {
-            if ("buy".equals(side)) {
+            if (isOpenBuy(side, tradeSide)) {
                 removePendingBuy(orderId, clientOid, orderPrice);
-            } else if ("sell".equals(side)) {
+            } else if (isCloseBuy(side, tradeSide)) {
                 removePendingSell(orderId, clientOid, orderPrice);
             }
             return;
@@ -740,7 +740,7 @@ public class AutoGridStrategy extends BaseStrategy {
 
         if (isOpenBuy(side, tradeSide)) {
             onBuyFilled(fillPrice, volume, orderId, clientOid, orderPrice);
-        } else if (isCloseSell(side, tradeSide)) {
+        } else if (isCloseBuy(side, tradeSide)) {
             onSellFilled(fillPrice, volume, orderId, clientOid);
         }
     }
@@ -863,14 +863,8 @@ public class AutoGridStrategy extends BaseStrategy {
                 || "buy_single".equals(tradeSide);
     }
 
-    private boolean isCloseSell(String side, String tradeSide) {
-        if (!"sell".equals(side)) {
-            return false;
-        }
-        return tradeSide == null
-                || "close".equals(tradeSide)
-                || "sell_single".equals(tradeSide)
-                || "reduce_sell_single".equals(tradeSide);
+    private boolean isCloseBuy(String side, String tradeSide) {
+        return "buy".equals(side) && "close".equals(tradeSide);
     }
 
     private BigDecimal firstPositive(BigDecimal... values) {
@@ -1008,7 +1002,7 @@ public class AutoGridStrategy extends BaseStrategy {
                     gridBuyOrder.exchangeOrderId = exchangeOrderId;
                     pendingBuyOrders.put(priceKey(price), gridBuyOrder);
                     buyCount++;
-                } else if ("sell".equals(side) && "close".equals(tradeSide)) {
+                } else if ("buy".equals(side) && "close".equals(tradeSide)) {
                     if (clientOid == null) {
                         clientOid = "SYNC_SELL_" + price.toPlainString();
                     }
@@ -1251,7 +1245,7 @@ public class AutoGridStrategy extends BaseStrategy {
     // ======================== 工具方法 ========================
 
     private JSONObject buildOrderRequest(String side, String tradeSide, String orderType,
-                                         BigDecimal price, BigDecimal size, boolean reduceOnly) {
+                                         BigDecimal price, BigDecimal size) {
         JSONObject orderInfo = new JSONObject();
         orderInfo.put("symbol", getPlainSymbol());
         orderInfo.put("marginMode", MARGIN_MODE);
@@ -1262,9 +1256,6 @@ public class AutoGridStrategy extends BaseStrategy {
         if (price != null) {
             orderInfo.put("price", normalizePrice(price).toPlainString());
         }
-        if (reduceOnly) {
-            orderInfo.put("reduceOnly", "YES");
-        }
         return orderInfo;
     }