diff --git a/utils/common/include/report_data_callback.h b/utils/common/include/report_data_callback.h
index e937c0748237f29103adee3057f1995a4020724d..4e15e6c45051698e7fdce3c66942852792a0f1f0 100755
--- a/utils/common/include/report_data_callback.h
+++ b/utils/common/include/report_data_callback.h
@@ -45,7 +45,7 @@ private:
     void FreeRedundantEventBuffer();
 private:
     std::vector<int32_t> recentWriteBlockNums_;
-    int32_t blockNumsUpdateIndex_ = 0;
+    uint32_t blockNumsUpdateIndex_ = 0;
 };
 
 using ReportDataCb = int32_t (ReportDataCallback::*)(SensorData *sensorData, sptr<ReportDataCallback> cb);
diff --git a/utils/common/src/report_data_callback.cpp b/utils/common/src/report_data_callback.cpp
index 299a8df07627798ab938cdb46b85cfcd5e48bd9f..6577415abb8cb9a1a72b855fb8ee0f24022134a7 100755
--- a/utils/common/src/report_data_callback.cpp
+++ b/utils/common/src/report_data_callback.cpp
@@ -53,7 +53,7 @@ int32_t ReportDataCallback::ReportEventCallback(SensorData *sensorData, sptr<Rep
         SEN_HILOGE("Callback is null");
         return ERROR;
     }
-    if (cb->eventsBuf_.writeFullBlockNum >= cb->eventsBuf_.blockList.size()) {
+    if (cb->eventsBuf_.writeFullBlockNum >= static_cast<int32_t>(cb->eventsBuf_.blockList.size())) {
         SEN_HILOGE("Event buffer more than the blockList size");
         return ERROR;
     }
@@ -116,7 +116,7 @@ void ReportDataCallback::FreeRedundantEventBuffer()
         return;
     }
 
-    for (int32_t index = maxWriteBlockNum; index < eventsBuf_.blockList.size(); ++index) {
+    for (int32_t index = maxWriteBlockNum; index < static_cast<int32_t>(eventsBuf_.blockList.size()); ++index) {
         if (eventsBuf_.blockList[index].dataBuf == nullptr) {
             break;
         }