diff --git a/mall-shop/src/main/java/com/suisung/mall/shop/activity/service/impl/ShopActivityCutpriceServiceImpl.java b/mall-shop/src/main/java/com/suisung/mall/shop/activity/service/impl/ShopActivityCutpriceServiceImpl.java
index 4b4913ed..ebf700c7 100644
--- a/mall-shop/src/main/java/com/suisung/mall/shop/activity/service/impl/ShopActivityCutpriceServiceImpl.java
+++ b/mall-shop/src/main/java/com/suisung/mall/shop/activity/service/impl/ShopActivityCutpriceServiceImpl.java
@@ -305,17 +305,19 @@ public class ShopActivityCutpriceServiceImpl extends BaseServiceImpl<ShopActivit
         queryWrapper.eq("activity_id", activity_id).eq("user_id", user_id);
         ShopActivityCutprice cutprice_row = findOne(queryWrapper);
 
+        // 需要检查活动有效期和活动商品库存是否足够
+        Pair<Boolean, String> checkStockResult = checkCutPriceExpiredAndStock(activityBase);
+
         // 立即参与活动？
         boolean is_join_activity = false;
 
         // 如果用户未参与该砍价活动，则创建新的砍价记录
         if (cutprice_row == null) {
-            // 需要检查活动有效期和活动商品库存是否足够
-            Pair<Boolean, String> check_result = checkCutPriceExpiredAndStock(activityBase);
-            if (!check_result.getFirst()) {
+
+            if (!checkStockResult.getFirst()) {
                 // 库存不够，立即更改活动状态为已结束
                 shopStoreActivityBaseService.updateActivityState(activity_id, StateCode.ACTIVITY_STATE_FINISHED);
-                throw new ApiException(check_result.getSecond());
+                throw new ApiException(checkStockResult.getSecond());
             }
 
             cutprice_row = new ShopActivityCutprice();
@@ -375,19 +377,24 @@ public class ShopActivityCutpriceServiceImpl extends BaseServiceImpl<ShopActivit
         // 设置活动规则信息
         activity_row.put("activity_rule", JSONUtil.parseObj(activity_row.get("activity_rule")));
 
-        // 判断是否可以立即购买
-        boolean canBuyNow = cutprice_row != null
-                && CheckUtil.isNotEmpty(cutprice_row.getAc_sale_price())
-                && CheckUtil.isNotEmpty(cutprice_row.getAc_mix_limit_price())
-                && NumberUtil.isLessOrEqual(cutprice_row.getAc_sale_price(), cutprice_row.getAc_mix_limit_price());
+        if (!checkStockResult.getFirst()) {
+            activity_row.put("can_buy_now", CommonConstant.Disable2);
+            activity_row.put("cannot_buy_now_reason", "抱歉，您慢了一步，商品已抢空！");
+        } else {
+            // 判断是否可以立即购买
+            boolean canBuyNow = cutprice_row != null
+                    && CheckUtil.isNotEmpty(cutprice_row.getAc_sale_price())
+                    && CheckUtil.isNotEmpty(cutprice_row.getAc_mix_limit_price())
+                    && NumberUtil.isLessOrEqual(cutprice_row.getAc_sale_price(), cutprice_row.getAc_mix_limit_price());
 
-        BigDecimal subtractPrice = NumberUtil.sub(cutprice_row.getAc_sale_price(), cutprice_row.getAc_mix_limit_price());
+            BigDecimal subtractPrice = NumberUtil.sub(cutprice_row.getAc_sale_price(), cutprice_row.getAc_mix_limit_price());
 
-        // 设置购买状态和提示信息
-        activity_row.put("can_buy_now", canBuyNow ? CommonConstant.Enable : CommonConstant.Disable2);
-        activity_row.put("cannot_buy_now_reason",
-                canBuyNow ? "恭喜您，商品可以立即出手了。" :
-                        String.format("还剩%.2f元到达商品底价，请继续加油！", subtractPrice));
+            // 设置购买状态和提示信息
+            activity_row.put("can_buy_now", canBuyNow ? CommonConstant.Enable : CommonConstant.Disable2);
+            activity_row.put("cannot_buy_now_reason",
+                    canBuyNow ? "恭喜您，商品可以立即出手了。" :
+                            String.format("还剩%.2f元到达商品底价，请继续加油！", subtractPrice));
+        }
 
         return activity_row;
     }
diff --git a/mall-shop/src/main/java/com/suisung/mall/shop/order/service/impl/ShopOrderBaseServiceImpl.java b/mall-shop/src/main/java/com/suisung/mall/shop/order/service/impl/ShopOrderBaseServiceImpl.java
index 6e7ea33f..b8153e8c 100644
--- a/mall-shop/src/main/java/com/suisung/mall/shop/order/service/impl/ShopOrderBaseServiceImpl.java
+++ b/mall-shop/src/main/java/com/suisung/mall/shop/order/service/impl/ShopOrderBaseServiceImpl.java
@@ -1585,7 +1585,12 @@ public class ShopOrderBaseServiceImpl extends BaseServiceImpl<ShopOrderBaseMappe
             // 判断是否为砍价活动
             Boolean isCutPriceActivity = shopStoreActivityBaseService.isCutPriceActivity(activityId);
             if (CheckUtil.isNotEmpty(acId) && isCutPriceActivity) {
-                cartData.put("ac_id", acId);
+                cartData.put("ac_id", acId); // shop_activity_cutprice 活动参与记录的自增id
+
+                // 判断砍价商品库存是否已售罄？
+                if (shopStoreActivityBaseService.isActProdSoldOut(activityId)) {
+                    throw new ApiException(I18nUtil._("砍价商品已售罄，请选择其他商品。"));
+                }
 
                 // 校验砍价活动，用户是否可以立即购买了？
                 Pair<Boolean, String> canDoOrderCutPriceActivity = shopActivityCutpriceService.canDoOrderCutPriceActivity(acId, userId);
@@ -1673,10 +1678,6 @@ public class ShopOrderBaseServiceImpl extends BaseServiceImpl<ShopOrderBaseMappe
                 }
             }
 
-            // 判断是否砍价购买
-            if (acId != null) {
-            }
-
             PayUserResource userResRow = payService.getPayUserResource(userId);
             if (userResRow != null) {
                 cartData.put("user_money", userResRow.getUser_money());
diff --git a/mall-shop/src/main/java/com/suisung/mall/shop/store/service/ShopStoreActivityBaseService.java b/mall-shop/src/main/java/com/suisung/mall/shop/store/service/ShopStoreActivityBaseService.java
index a4e13842..40bc6b6e 100644
--- a/mall-shop/src/main/java/com/suisung/mall/shop/store/service/ShopStoreActivityBaseService.java
+++ b/mall-shop/src/main/java/com/suisung/mall/shop/store/service/ShopStoreActivityBaseService.java
@@ -209,4 +209,11 @@ public interface ShopStoreActivityBaseService extends IBaseService<ShopStoreActi
     boolean updateActivityState(Integer activity_id, Integer activity_state);
 
 
+    /**
+     * 判断活动商品是否售完
+     *
+     * @param activity_id
+     * @return
+     */
+    boolean isActProdSoldOut(Integer activity_id);
 }
diff --git a/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java b/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java
index e8964400..a3855427 100644
--- a/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java
+++ b/mall-shop/src/main/java/com/suisung/mall/shop/store/service/impl/ShopStoreActivityBaseServiceImpl.java
@@ -48,6 +48,7 @@ import com.suisung.mall.shop.base.service.ShopBaseCurrencyService;
 import com.suisung.mall.shop.base.service.ShopBaseStateCodeService;
 import com.suisung.mall.shop.order.service.ShopOrderBaseService;
 import com.suisung.mall.shop.order.service.ShopOrderDataService;
+import com.suisung.mall.shop.order.service.ShopOrderInfoService;
 import com.suisung.mall.shop.product.pojo.vo.ProductVo;
 import com.suisung.mall.shop.product.service.ShopProductBaseService;
 import com.suisung.mall.shop.product.service.ShopProductImageService;
@@ -92,6 +93,9 @@ public class ShopStoreActivityBaseServiceImpl extends BaseServiceImpl<ShopStoreA
     ShopOrderBaseService shopOrderBaseService;
     @Autowired
     ShopUserVoucherService shopUserVoucherService;
+    @Lazy
+    @Autowired
+    ShopOrderInfoService shopOrderInfoService;
     @Autowired
     private ShopStoreActivityBaseMapper shopStoreActivityBaseMapper;
     @Lazy
@@ -134,6 +138,7 @@ public class ShopStoreActivityBaseServiceImpl extends BaseServiceImpl<ShopStoreA
     private ShopActivityGroupbookingService shopActivityGroupbookingService;
     @Autowired
     private ShopStoreActivityCodeService shopStoreActivityCodeService;
+    @Lazy
     @Autowired
     private ShopOrderDataService shopOrderDataService;
     @Autowired
@@ -4473,6 +4478,65 @@ public class ShopStoreActivityBaseServiceImpl extends BaseServiceImpl<ShopStoreA
         }
     }
 
+    /**
+     * 判断活动商品是否售完
+     *
+     * @param activity_id 活动ID
+     * @return boolean 是否已售完
+     */
+    @Override
+    public boolean isActProdSoldOut(Integer activity_id) {
+        // 参数校验：检查活动ID是否有效
+        if (activity_id == null || activity_id <= 0) {
+            logger.warn("活动商品售完检查失败：无效的活动ID - {}", activity_id);
+            return true; // 将无效输入视为"已售完"
+        }
+
+        try {
+            // 直接从数据库查询活动记录，只获取需要的字段以提高性能
+            ShopStoreActivityBase activity = lambdaQuery()
+                    .select(ShopStoreActivityBase::getProduct_count)  // 只查询库存字段
+                    .eq(ShopStoreActivityBase::getActivity_id, activity_id)
+                    .one();
+
+            // 如果活动不存在，视为已售完
+            if (activity == null) {
+                logger.warn("活动商品售完检查：未找到活动记录，activity_id={}", activity_id);
+                return true;
+            }
+
+            // 获取商品库存数量
+            Integer productCount = activity.getProduct_count();
+            logger.debug("活动商品库存检查：activity_id={}, 库存数量={}", activity_id, productCount);
+
+            // 如果库存为null或小于等于0，视为已售完
+            if (productCount == null || productCount <= 0) {
+                logger.info("活动商品售完检查：库存为0或空，activity_id={}", activity_id);
+                return true;
+            }
+
+            // 获取该活动已成功的订单数量
+            long soldCount = shopOrderInfoService.fetchActivityOrderSuccessCount(
+                    Convert.toStr(activity_id),
+                    Convert.toStr(StateCode.ACTIVITY_TYPE_CUTPRICE));
+
+            logger.debug("活动商品售完检查：activity_id={}, 已售数量={}, 库存数量={}",
+                    activity_id, soldCount, productCount);
+
+            // 如果已售数量大于等于库存数量，则已售完
+            boolean isSoldOut = soldCount >= productCount;
+            if (isSoldOut) {
+                logger.info("活动商品已售完：activity_id={}, 已售数量={}, 库存数量={}",
+                        activity_id, soldCount, productCount);
+            }
+
+            return isSoldOut;
+        } catch (Exception e) {
+            logger.error("活动商品售完检查异常：activity_id={}", activity_id, e);
+            return true; // 出现异常时保守地返回已售完
+        }
+    }
+
 
     @Transactional
     public boolean removeActivityBase(Integer activity_id, ShopStoreActivityBase activity_row) {