diff --git a/src/stores/project.ts b/src/stores/project.ts
index e032be8..d3ba025 100644
--- a/src/stores/project.ts
+++ b/src/stores/project.ts
@@ -211,6 +211,10 @@ function createStore() {
       try {
         // 固时间戳(FR-C1):formattedEvents computed 重算时用事件发生时刻,非当前时刻
         state.liveEvents.push({ ...payload, _ts: Date.now() })
+        // 限长(FR-R3):防 liveEvents 无限增长撑爆内存,保留最近 200 条
+        if (state.liveEvents.length > 200) {
+          state.liveEvents.splice(0, state.liveEvents.length - 200)
+        }
         // 处理人工审批请求
         // WorkflowEvent serde tag=type rename_all=snake_case → type='human_approval_request'，字段扁平(无 data 包装)(B-03b-R7)
         if (payload.event?.type === 'human_approval_request') {