diff --git a/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt b/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt
index 8b3a220..98110b0 100644
--- a/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt
+++ b/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt
@@ -379,6 +379,7 @@
             targetPoint = nearestPoint.convertPointF()
         } else {
             points?.clear()
+            targetPoint = null
             callback.getNearestPoint(null)
         }
         //不管有无数据点，都要刷新点位数据，不然从有数据到无数据这个过程，界面不会及时刷新