diff --git a/dm/test/systemtest/display_power_test.cpp b/dm/test/systemtest/display_power_test.cpp
index 5308157d07..d03be7623e 100644
--- a/dm/test/systemtest/display_power_test.cpp
+++ b/dm/test/systemtest/display_power_test.cpp
@@ -130,6 +130,7 @@ HWTEST_F(DisplayPowerTest, register_display_power_event_listener_001, Function |
     sptr<IDisplayPowerEventListener> listener = new DisplayPowerEventListener();
     bool ret = DisplayManager::GetInstance().RegisterDisplayPowerEventListener(listener);
     ASSERT_EQ(true, ret);
+    DisplayManager::GetInstance().UnregisterDisplayPowerEventListener(listener);
 }
 
 /**
@@ -143,6 +144,42 @@ HWTEST_F(DisplayPowerTest, register_display_power_event_listener_002, Function |
     ASSERT_EQ(false, ret);
 }
 
+/**
+ * @tc.name: unregister_display_power_event_listener_001
+ * @tc.desc: call UnregisterDisplayPowerEventListener with a valid listener and check return value
+ * @tc.type: FUNC
+ */
+HWTEST_F(DisplayPowerTest, unregister_display_power_event_listener_001, Function | SmallTest | Level2)
+{
+    sptr<IDisplayPowerEventListener> listener = new DisplayPowerEventListener();
+    DisplayManager::GetInstance().RegisterDisplayPowerEventListener(listener);
+    bool ret = DisplayManager::GetInstance().UnregisterDisplayPowerEventListener(listener);
+    ASSERT_EQ(true, ret);
+}
+
+/**
+* @tc.name: unregister_display_power_event_listener_002
+* @tc.desc: call UnregisterDisplayPowerEventListener with nullptr and check return value
+* @tc.type: FUNC
+*/
+HWTEST_F(DisplayPowerTest, unregister_display_power_event_listener_002, Function | SmallTest | Level2)
+{
+    bool ret = DisplayManager::GetInstance().UnregisterDisplayPowerEventListener(nullptr);
+    ASSERT_EQ(false, ret);
+}
+
+/**
+* @tc.name: unregister_display_power_event_listener_003
+* @tc.desc: call UnregisterDisplayPowerEventListener with an invalid listener and check return value
+* @tc.type: FUNC
+*/
+HWTEST_F(DisplayPowerTest, unregister_display_power_event_listener_003, Function | SmallTest | Level2)
+{
+    sptr<IDisplayPowerEventListener> listener = new DisplayPowerEventListener();
+    bool ret = DisplayManager::GetInstance().UnregisterDisplayPowerEventListener(listener);
+    ASSERT_EQ(false, ret);
+}
+
 /**
  * @tc.name: set_display_state_001
  * @tc.desc: Call SetDisplayState and check if it the state set is the same as calling GetDisplayState