diff --git a/plugins/point_trade/config.toml b/plugins/point_trade/config.toml
index 3780cb6..4272e9f 100644
--- a/plugins/point_trade/config.toml
+++ b/plugins/point_trade/config.toml
@@ -10,7 +10,8 @@ command-format = """
 """
 
 # 打劫功能配置
-rob-success-rate = 0.3    # 打劫成功率，范围0-1
+rob-success-rate = 0.3      # 基础打劫成功率
+rob-rate-decay = 0.5        # 积分差距成功率衰减系数
 rob-min-percent = 0.1     # 打劫成功时最小获取目标积分百分比
 rob-max-percent = 0.3     # 打劫成功时最大获取目标积分百分比
 rob-penalty-percent = 0.2 # 打劫失败时的惩罚百分比(扣除自身积分的比例)
diff --git a/plugins/point_trade/main.py b/plugins/point_trade/main.py
index 088f726..d47d664 100644
--- a/plugins/point_trade/main.py
+++ b/plugins/point_trade/main.py
@@ -82,7 +82,8 @@ class PointTradePlugin(MessagePluginInterface):
         self.enable = point_trade_config.get("enable", True)
 
         # 打劫功能配置
-        self.rob_success_rate = point_trade_config.get("rob-success-rate", 0.3)  # 打劫成功率
+        self.rob_success_rate = point_trade_config.get("rob-success-rate", 0.3)  # 基础打劫成功率
+        self.rob_rate_decay = point_trade_config.get("rob-rate-decay", 0.5)     # 积分差距导致的成功率衰减系数
         self.rob_min_percent = point_trade_config.get("rob-min-percent", 0.1)  # 打劫最小百分比
         self.rob_max_percent = point_trade_config.get("rob-max-percent", 0.3)  # 打劫最大百分比
         self.rob_penalty_percent = point_trade_config.get("rob-penalty-percent", 0.2)  # 打劫失败惩罚百分比
@@ -496,7 +497,20 @@ class PointTradePlugin(MessagePluginInterface):
             target_name = target_info.get('wx_nick_name', target_wxid) if target_info else target_wxid
 
             # 决定打劫是否成功
-            is_success = random.random() < self.rob_success_rate
+            # 计算积分差距对成功率的影响
+            points_diff = target_total - robber_total
+            if points_diff > 0:
+                # 如果目标积分比打劫者高，降低成功率
+                diff_ratio = min(points_diff / target_total, 1.0)  # 差距比例，最大为1
+                final_success_rate = self.rob_success_rate * (1 - diff_ratio * self.rob_rate_decay)
+            else:
+                # 如果打劫者积分比目标高，使用基础成功率
+                final_success_rate = self.rob_success_rate
+
+            # 确保成功率在合理范围内
+            final_success_rate = max(0.05, min(final_success_rate, self.rob_success_rate))
+            
+            is_success = random.random() < final_success_rate
 
             # 更新冷却时间
             self.rob_cooldown_records[sender] = current_time