diff --git a/eqpalg/utility/eqp_stat.cc b/eqpalg/utility/eqp_stat.cc
index 61ed936..9b795c8 100644
--- a/eqpalg/utility/eqp_stat.cc
+++ b/eqpalg/utility/eqp_stat.cc
@@ -134,9 +134,7 @@ bool EqpStat::update_cold(const std::string &ruleid,
                           const RuleStatShm::RuleStatLocal &rule_stat) {
   try {
     RuleStatShm::RuleStatCold cold;
-    cold.stat_values.assign(rule_stat.stat_values.begin(),
-                            rule_stat.stat_values.end());
-    cold.fetch_mark = rule_stat.fetch_mark;
+    // stat_values 和 fetch_mark 由 SHM 的 add_stat_value/get_stat_value 握手管理
     cold.running_time = rule_stat.running_time;
     cold.shear_times = rule_stat.shear_times;
     return mapRuleStat.update_cold_fields(ruleid, cold);
diff --git a/shm/RuleStatShm.h b/shm/RuleStatShm.h
index 817c582..5d895fc 100644
--- a/shm/RuleStatShm.h
+++ b/shm/RuleStatShm.h
@@ -166,10 +166,10 @@ struct RuleStatCold {
     return true;
   }
 
+  /// 仅同步 running_time / shear_times，不覆盖 stat_values 和 fetch_mark
+  ///（后者由 add_stat_value / get_stat_value 握手管理）
   bool update_cold(const RuleStatCold &value) {
     try {
-      stat_values = value.stat_values;
-      fetch_mark = value.fetch_mark;
       running_time = value.running_time;
       shear_times = value.shear_times;
     } catch (...) {