diff --git a/services/reminder/include/reminder_data_manager.h b/services/reminder/include/reminder_data_manager.h
index efe1cfeb484ba18738226f1e7400c376685bd7cf..2467c7a31989378691a2c118714bae6348d634b5 100644
--- a/services/reminder/include/reminder_data_manager.h
+++ b/services/reminder/include/reminder_data_manager.h
@@ -712,6 +712,7 @@ private:
     static std::mutex ALERT_MUTEX;
     static std::mutex TIMER_MUTEX;
     static std::mutex ACTIVE_MUTEX;
+    std::mutex cancelMutex_; // for cancelReminder function
 
     /**
      * Max number of reminders limit for the whole system.
diff --git a/services/reminder/src/reminder_data_manager.cpp b/services/reminder/src/reminder_data_manager.cpp
index 56d5dd1ac71fc38fbc591ab55c6ad92e9b7cb1e4..c68da5ef7ab2da9cda88d3b8b424bf0c051a39bd 100644
--- a/services/reminder/src/reminder_data_manager.cpp
+++ b/services/reminder/src/reminder_data_manager.cpp
@@ -130,6 +130,7 @@ ErrCode ReminderDataManager::CancelReminder(
         ANSR_LOGW("Not find the reminder due to not match");
         return ERR_REMINDER_NOT_EXIST;
     }
+    std::lock_guard<std::mutex> locker(cancelMutex_);
     if (activeReminderId_ == reminderId) {
         {
             std::lock_guard<std::mutex> locker(ReminderDataManager::ACTIVE_MUTEX);
diff --git a/services/reminder/test/unittest/reminder_data_manager_test.cpp b/services/reminder/test/unittest/reminder_data_manager_test.cpp
index ba3db22dd5e7210b22c4de0317825123e29247d9..56b2552318b510d69ca85068a1c60d3427e35dc2 100644
--- a/services/reminder/test/unittest/reminder_data_manager_test.cpp
+++ b/services/reminder/test/unittest/reminder_data_manager_test.cpp
@@ -1638,7 +1638,7 @@ HWTEST_F(ReminderDataManagerTest, ReminderDataManagerTest_038, Level1)
     Uri enableUri(uriStr);
     std::string enable;
     auto ret = ReminderDataShareHelper::GetInstance().Query(enableUri, "focus_mode_enable", enable);
-    EXPECT_TRUE(ret == false);
+    EXPECT_EQ(ret, false);
 }
 }  // namespace Notification
 }  // namespace OHOS