diff --git a/model/sensor/driver/accel/sensor_gravity_driver.c b/model/sensor/driver/accel/sensor_gravity_driver.c
index a697d7d7..da5cd746 100755
--- a/model/sensor/driver/accel/sensor_gravity_driver.c
+++ b/model/sensor/driver/accel/sensor_gravity_driver.c
@@ -65,7 +65,7 @@ static void GravityDataWorkEntry(void *arg)
         HDF_LOGE("%s: Get time failed", __func__);
         return;
     }
-    event.timestamp = time.sec * SENSOR_SECOND_CONVERT_NANOSECOND + time.usec * SENSOR_CONVERT_UNIT; /* unit nanosecond */
+    event.timestamp = time.sec * SENSOR_SECOND_CONVERT_NANOSECOND + time.usec * SENSOR_CONVERT_UNIT;
     event.sensorId = SENSOR_TAG_GRAVITY;
     event.option = 0;
     event.mode = SENSOR_WORK_MODE_REALTIME;
@@ -332,4 +332,4 @@ struct HdfDriverEntry g_sensorGravityDevEntry = {
     .Release = GravityReleaseDriver,
 };
 
-HDF_INIT(g_sensorGravityDevEntry);
\ No newline at end of file
+HDF_INIT(g_sensorGravityDevEntry);