diff --git a/plugins/point_trade/main.py b/plugins/point_trade/main.py
index 77e84ac..2d393d9 100644
--- a/plugins/point_trade/main.py
+++ b/plugins/point_trade/main.py
@@ -634,13 +634,26 @@ class PointTradePlugin(MessagePluginInterface):
                 # 确保至少抢到1点积分
                 rob_amount = max(1, rob_amount)
 
-                # 执行积分转移
+                # 计算抽水金额（20%）
+                tax_amount = int(rob_amount * 0.2)
+                # 确保至少抽水1点积分
+                tax_amount = max(1, tax_amount)
+                # 实际获得的积分
+                actual_rob_amount = rob_amount - tax_amount
+
+                # 执行积分转移（从目标到打劫者）
                 success, result = self.points_db.transfer_points(
                     target_wxid, robber_wxid, roomid,
-                    rob_amount, f"被{robber_name}打劫"
+                    actual_rob_amount, f"被{robber_name}打劫"
                 )
 
-                if success:
+                # 执行抽水（从目标到SYSTEM）
+                tax_success, tax_result = self.points_db.transfer_points(
+                    target_wxid, "SYSTEM", roomid,
+                    tax_amount, f"打劫抽水"
+                )
+
+                if success and tax_success:
                     # 获取转账后的积分信息
                     from_user = result.get("from_user", {})
                     to_user = result.get("to_user", {})
@@ -649,6 +662,7 @@ class PointTradePlugin(MessagePluginInterface):
                     output = (
                         f"🔫 打劫成功！\n"
                         f"👤{robber_name} 成功打劫了 👤{target_name} {rob_amount} 积分！\n"
+                        f"💰 实际获得: {actual_rob_amount} 积分 | 系统抽水: {tax_amount} 积分(20%)\n"
                         f"👤{robber_name} 当前积分: {to_user.get('total_points', 0)}\n"
                         f"👤{target_name} 当前积分: {from_user.get('total_points', 0)}"
                     )