diff --git a/base/src/event_demultiplexer.cpp b/base/src/event_demultiplexer.cpp
index 34c109e79088f518e917160631feda7904730425..a42958fc32dcca1dd4c9bbefb793c82c82036d3d 100644
--- a/base/src/event_demultiplexer.cpp
+++ b/base/src/event_demultiplexer.cpp
@@ -106,9 +106,8 @@ uint32_t EventDemultiplexer::Update(int operation, EventHandler* handler)
     return TIMER_ERR_OK;
 }
 
-int EventDemultiplexer::Polling(int timeout /* ms */)
+int EventDemultiplexer::Polling(int timeout /* ms */, std::vector<epoll_event>& epollEvents)
 {
-    std::vector<struct epoll_event> epollEvents(maxEvents_);
     std::vector<std::shared_ptr<EventHandler>> taskQue;
     std::vector<uint32_t> eventQue;
 
@@ -156,6 +155,7 @@ int EventDemultiplexer::Polling(int timeout /* ms */)
 
     if (nfds == maxEvents_) {
         maxEvents_ *= HALF_OF_MAX_EVENT;
+        epollEvents.resize(maxEvents_);
     }
     return nfds;
 }
diff --git a/base/src/event_demultiplexer.h b/base/src/event_demultiplexer.h
index 02b2d9a6a31a6e2af335635977486a66a87171f4..3aea06eef53fa8844239436eae30d818403a54ce 100644
--- a/base/src/event_demultiplexer.h
+++ b/base/src/event_demultiplexer.h
@@ -22,6 +22,8 @@
 #include <map>
 #include <queue>
 #include <tuple>
+#include <sys/epoll.h>
+#include <vector>
 
 namespace OHOS {
 namespace Utils {
@@ -38,10 +40,12 @@ public:
     uint32_t StartUp();
     void CleanUp();
 
-    int Polling(int timeout);
+    int Polling(int timeout, std::vector<epoll_event>& epollEvents);
 
     uint32_t UpdateEventHandler(EventHandler* handler);
 
+    int GetMaxEvents() const { return maxEvents_; }
+
 private:
     uint32_t Update(int operation, EventHandler* handler);
     static uint32_t Reactor2Epoll(uint32_t reactorEvent);
diff --git a/base/src/event_reactor.cpp b/base/src/event_reactor.cpp
index c61471c213ed39c8fd524ec134f356c73c92eb47..ba06a8cf635b1f2ee96a465db040f798dbaf990d 100644
--- a/base/src/event_reactor.cpp
+++ b/base/src/event_reactor.cpp
@@ -71,8 +71,9 @@ void EventReactor::RunLoop(int timeout) const
         return;
     }
 
+    std::vector<epoll_event> epollEvents(demultiplexer_->GetMaxEvents());
     while (loopReady_ && switch_) {
-        if (demultiplexer_->Polling(timeout) == EPOLL_CRITICAL_ERROR) {
+        if (demultiplexer_->Polling(timeout, epollEvents) == EPOLL_CRITICAL_ERROR) {
             UTILS_LOGD("polling critical error occure: %{public}d", timeout);
             break;
         }