diff --git a/src/main/java/com/sample/trend/config/CommonConstant.java b/src/main/java/com/sample/trend/config/CommonConstant.java
index a54adfc..2447d09 100644
--- a/src/main/java/com/sample/trend/config/CommonConstant.java
+++ b/src/main/java/com/sample/trend/config/CommonConstant.java
@@ -4,12 +4,18 @@ import vip.uuquant.exhangeapi.core.ExchangeFactory;
 import vip.uuquant.exhangeapi.core.HttpClient;
 import vip.uuquant.exhangeapi.core.WebSocketManager;
 
+import java.net.InetSocketAddress;
+import java.net.Proxy;
+
 /**
  * 交易所客户端全局单例
  */
 public class CommonConstant {
 
-    public static final HttpClient httpClient = HttpClient.builder().build();
+    /** 全局 HTTP 代理 */
+    public static final Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 7897));
+
+    public static final HttpClient httpClient = HttpClient.builder().proxy(proxy).build();
 
     public static final WebSocketManager webSocketManager = new WebSocketManager(httpClient);
 
diff --git a/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java b/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
index bf7cb1f..f433e84 100644
--- a/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
+++ b/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
@@ -32,6 +32,7 @@ import java.util.concurrent.CopyOnWriteArrayList;
  * 基于 ATR 的动态网格策略（只做多）。
  * <p>
  * 网格间距 = atr_multiplier × ATR，并限制在 [min_gap, max_gap] 区间。
+ * 下方买单始终最多挂 1 笔：成交后再挂下一格，不会批量铺满网格。
  * 采用限价挂单买入，市价止盈卖出。
  * 网格间距变化时不撤销已有挂单，已成交仓位按最新间距计算止盈价。
  */
@@ -54,7 +55,7 @@ public class AutoGridStrategy extends BaseStrategy {
     private boolean testMode;
     private int leverage;
     /**
-     * 最大待成交买单数量
+     * 最大持仓层数；达到后不再新建买单。待成交买单始终最多 1 笔。
      */
     private int gridCount;
 
@@ -246,6 +247,7 @@ public class AutoGridStrategy extends BaseStrategy {
 
         refreshGridGap(true);
         syncOpenOrdersFromExchange();
+        pruneExcessPendingBuys();
         placeInitialBuyGrids();
 
         createTask(this::syncAccount, 5, 600);
@@ -299,7 +301,7 @@ public class AutoGridStrategy extends BaseStrategy {
         bitGetClient.changeTestMode(testMode);
         AccountVO account = getAccount();
         bitGetClient.init(account.getApiKey(), account.getSecretKey(), account.getPassphrase(),
-                null, CommonConstant.webSocketManager);
+                CommonConstant.httpClient, CommonConstant.webSocketManager);
 //        try {
 //            bitGetClient.setLeverage(getSymbol(), leverage);
 //        } catch (Exception e) {
@@ -357,19 +359,14 @@ public class AutoGridStrategy extends BaseStrategy {
     private BigDecimal fetchAtr() throws Exception {
         JSONObject params = new JSONObject();
         params.put("symbol", getPlainSymbol());
-        params.put("granularity", normalizeKlineInterval(klineInterval));
+        params.put("granularity", klineInterval);
         params.put("limit", String.valueOf(klinePeriod + 2));
 
         JSONArray klines = bitGetClient.getKLines(params);
         if (klines == null || klines.isEmpty()) {
             return null;
         }
-        // BitGet 返回倒序，转为升序
-        JSONArray sorted = new JSONArray();
-        for (int i = klines.size() - 1; i >= 0; i--) {
-            sorted.add(klines.getJSONArray(i));
-        }
-        return AtrCalculator.calculate(sorted, klinePeriod);
+        return AtrCalculator.calculate(klines, klinePeriod);
     }
 
     private String normalizeKlineInterval(String interval) {
@@ -418,7 +415,7 @@ public class AutoGridStrategy extends BaseStrategy {
     // ======================== 网格挂单 ========================
 
     /**
-     * 初始化仅挂下方一格买单，与运行中补单逻辑一致，避免网格间距调整后批量挂单失配。
+     * 初始化仅挂下方一格买单，与运行中补单逻辑一致。
      */
     private void placeInitialBuyGrids() {
         if (currentPrice == null || currentGridGap == null) {
@@ -427,25 +424,22 @@ public class AutoGridStrategy extends BaseStrategy {
         replenishBuyGrids();
     }
 
+    /**
+     * 无待成交买单时，在现价下方挂一格；已有挂单则不补，保证始终只有 1 笔买单。
+     */
     private void replenishBuyGrids() {
-        if (!canPlaceBuyOrders() || currentGridGap == null) {
+        if (!canPlaceBuyOrders() || currentGridGap == null || currentPrice == null) {
             return;
         }
 
         synchronized (tradeLock) {
-            if (pendingBuyOrders.size() >= gridCount) {
+            if (!pendingBuyOrders.isEmpty() || openPositions.size() >= gridCount) {
                 return;
             }
 
-            BigDecimal lowestPending = findLowestPendingBuyPrice();
-            BigDecimal nextBuyPrice;
-
-            if (lowestPending != null) {
-                nextBuyPrice = lowestPending.subtract(currentGridGap);
-            } else if (currentPrice != null) {
-                nextBuyPrice = alignPriceDown(currentPrice, currentGridGap);
-            } else {
-                return;
+            BigDecimal nextBuyPrice = alignPriceDown(currentPrice, currentGridGap);
+            if (nextBuyPrice.compareTo(currentPrice) >= 0) {
+                nextBuyPrice = nextBuyPrice.subtract(currentGridGap);
             }
 
             if (nextBuyPrice.compareTo(lowerBound) >= 0 && !hasBuyOrderAt(nextBuyPrice)) {
@@ -454,8 +448,28 @@ public class AutoGridStrategy extends BaseStrategy {
         }
     }
 
+    /**
+     * 买单成交后，挂「成交价再下一格」的限价买单。
+     */
+    private void placeNextBuyBelow(BigDecimal filledPrice) {
+        if (!canPlaceBuyOrders() || currentGridGap == null || filledPrice == null) {
+            return;
+        }
+
+        synchronized (tradeLock) {
+            if (!pendingBuyOrders.isEmpty() || openPositions.size() >= gridCount) {
+                return;
+            }
+
+            BigDecimal nextBuyPrice = normalizePrice(filledPrice.subtract(currentGridGap));
+            if (nextBuyPrice.compareTo(lowerBound) >= 0 && !hasBuyOrderAt(nextBuyPrice)) {
+                placeLimitBuyOrder(nextBuyPrice);
+            }
+        }
+    }
+
     private void placeLimitBuyOrder(BigDecimal price) {
-        if (pendingBuyOrders.size() >= gridCount) {
+        if (!pendingBuyOrders.isEmpty() || openPositions.size() >= gridCount) {
             return;
         }
         BigDecimal normalizedPrice = normalizePrice(price);
@@ -613,6 +627,9 @@ public class AutoGridStrategy extends BaseStrategy {
 
         submitOrderSync(orderId, clientPositionId, normalizedPrice, volume, OrderSide.BUY, OrderStatus.FILLED);
         submitPositionSync(clientPositionId, normalizedPrice, volume, true);
+
+        // 成交后再挂下方一格，保证永远只有一笔待成交买单
+        placeNextBuyBelow(normalizedPrice);
     }
 
     private void onSellFilled(BigDecimal price, BigDecimal volume, String orderId) {
@@ -688,6 +705,48 @@ public class AutoGridStrategy extends BaseStrategy {
         }
     }
 
+    /**
+     * 若交易所上残留多笔买单，只保留最靠近现价（价格最高）的一笔，撤销其余。
+     */
+    private void pruneExcessPendingBuys() {
+        if (pendingBuyOrders.size() <= 1) {
+            return;
+        }
+
+        synchronized (tradeLock) {
+            GridBuyOrder keep = pendingBuyOrders.values().stream()
+                    .max(Comparator.comparing(o -> o.buyPrice))
+                    .orElse(null);
+            if (keep == null) {
+                return;
+            }
+
+            List<GridBuyOrder> extras = new ArrayList<>();
+            for (GridBuyOrder order : pendingBuyOrders.values()) {
+                if (order.buyPrice.compareTo(keep.buyPrice) != 0) {
+                    extras.add(order);
+                }
+            }
+
+            for (GridBuyOrder order : extras) {
+                try {
+                    bitGetClient.cancelOrder(getSymbol(), order.exchangeOrderId, order.clientOrderId, null);
+                    pendingBuyOrders.remove(priceKey(order.buyPrice));
+                    logger.info("撤销多余买单：价格={}，订单号={}", order.buyPrice, order.exchangeOrderId);
+                } catch (Exception e) {
+                    logger.error("撤销多余买单失败，价格={}", order.buyPrice, e);
+                }
+            }
+
+            if (!extras.isEmpty()) {
+                submitAlarm("清理多余挂单",
+                        String.format("仅保留最靠近现价的买单 %s，已撤销 %d 笔",
+                                formatPrice(keep.buyPrice), extras.size()),
+                        AlarmLevel.INFO);
+            }
+        }
+    }
+
     private void fetchCurrentPriceFromRest() {
         try {
             JSONObject ticker = bitGetClient.getTicker(getSymbol());
@@ -772,9 +831,9 @@ public class AutoGridStrategy extends BaseStrategy {
         sb.append("<div>当前价：").append(formatPrice(currentPrice)).append("</div>");
         sb.append("<div>ATR：").append(formatPrice(currentAtr)).append("</div>");
         sb.append("<div>网格间距：").append(formatPrice(currentGridGap)).append("</div>");
-        sb.append("<div>待成交买单：").append(pendingBuyOrders.size())
-                .append(" / ").append(gridCount).append(" 笔</div>");
-        sb.append("<div>持仓待止盈：").append(openPositions.size()).append(" 笔</div>");
+        sb.append("<div>待成交买单：").append(pendingBuyOrders.size()).append(" / 1 笔</div>");
+        sb.append("<div>持仓待止盈：").append(openPositions.size())
+                .append(" / ").append(gridCount).append(" 层</div>");
         sb.append("<div>上限暂停：").append(upperBoundPaused ? "是" : "否").append("</div>");
         sb.append("<div>下限暂停：").append(lowerBoundPaused ? "是" : "否").append("</div>");
 
@@ -858,13 +917,6 @@ public class AutoGridStrategy extends BaseStrategy {
         return orderInfo;
     }
 
-    private BigDecimal findLowestPendingBuyPrice() {
-        return pendingBuyOrders.values().stream()
-                .map(o -> o.buyPrice)
-                .min(BigDecimal::compareTo)
-                .orElse(null);
-    }
-
     private boolean hasBuyOrderAt(BigDecimal price) {
         return pendingBuyOrders.containsKey(priceKey(normalizePrice(price)));
     }