diff --git a/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java b/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
index 69e22ba..97f3bad 100644
--- a/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
+++ b/src/main/java/com/sample/trend/strategy/AutoGridStrategy.java
@@ -51,6 +51,7 @@ public class AutoGridStrategy extends BaseStrategy {
     private final Logger logger = LoggerFactory.getLogger(AutoGridStrategy.class);
 
     // 运行参数
+    /** 每格购买价值（报价币金额），下单数量 = baseQuantity / price */
     private BigDecimal baseQuantity;
     private BigDecimal atrMultiplier;
     private String gridGrpScript;
@@ -613,9 +614,15 @@ public class AutoGridStrategy extends BaseStrategy {
             return;
         }
 
+        BigDecimal quantity = quantityFromBaseValue(normalizedPrice);
+        if (quantity.compareTo(BigDecimal.ZERO) <= 0) {
+            logger.warn("按购买价值换算数量无效：价值={}，价格={}", baseQuantity, normalizedPrice);
+            return;
+        }
+
         String clientOrderId = buildClientOrderId("BUY", normalizedPrice);
         try {
-            JSONObject orderInfo = buildOrderRequest("buy", "open", "limit", normalizedPrice, baseQuantity);
+            JSONObject orderInfo = buildOrderRequest("buy", "open", "limit", normalizedPrice, quantity);
             orderInfo.put("clientOid", clientOrderId);
 
             JSONObject result = bitGetClient.placeOrder(orderInfo);
@@ -625,8 +632,9 @@ public class AutoGridStrategy extends BaseStrategy {
             gridBuyOrder.exchangeOrderId = exchangeOrderId;
             pendingBuyOrders.put(priceKey(normalizedPrice), gridBuyOrder);
 
-            logger.info("挂买单成功：价格={}，订单号={}", normalizedPrice, exchangeOrderId);
-            submitOrderSync(exchangeOrderId, clientOrderId, normalizedPrice, baseQuantity,
+            logger.info("挂买单成功：价格={}，数量={}（价值={}），订单号={}",
+                    normalizedPrice, quantity, baseQuantity, exchangeOrderId);
+            submitOrderSync(exchangeOrderId, clientOrderId, normalizedPrice, quantity,
                     OrderSide.BUY, OrderStatus.NEW);
         } catch (Exception e) {
             logger.error("挂买单失败，价格={}", normalizedPrice, e);
@@ -1052,7 +1060,8 @@ public class AutoGridStrategy extends BaseStrategy {
                             ? "POS_" + entryPrice.toPlainString()
                             : "SYNC_POS_" + price.toPlainString();
                     if (quantity == null) {
-                        quantity = baseQuantity;
+                        BigDecimal refPrice = entryPrice != null ? entryPrice : price;
+                        quantity = quantityFromBaseValue(refPrice);
                     }
                     GridSellOrder sellOrder = new GridSellOrder(clientOid, clientPositionId, price, quantity);
                     sellOrder.exchangeOrderId = exchangeOrderId;
@@ -1232,7 +1241,7 @@ public class AutoGridStrategy extends BaseStrategy {
             JSONObject row = new JSONObject();
             row.put("type", "待成交买单");
             row.put("price", formatPrice(order.buyPrice));
-            row.put("quantity", baseQuantity.toPlainString());
+            row.put("quantity", quantityFromBaseValue(order.buyPrice).toPlainString());
             row.put("takeProfit", "-");
             rows.add(row);
         }
@@ -1350,6 +1359,16 @@ public class AutoGridStrategy extends BaseStrategy {
         return qty.setScale(quantityPrecision, RoundingMode.DOWN);
     }
 
+    /**
+     * 购买价值换算为合约/币数量：数量 = baseQuantity / price
+     */
+    private BigDecimal quantityFromBaseValue(BigDecimal price) {
+        if (baseQuantity == null || price == null || price.compareTo(BigDecimal.ZERO) <= 0) {
+            return BigDecimal.ZERO;
+        }
+        return normalizeQuantity(baseQuantity.divide(price, quantityPrecision + 8, RoundingMode.DOWN));
+    }
+
     private String priceKey(BigDecimal price) {
         return normalizePrice(price).toPlainString();
     }