diff --git a/libs/maps.js b/libs/maps.js
index 74974cd0..8c2aa54b 100644
--- a/libs/maps.js
+++ b/libs/maps.js
@@ -1644,8 +1644,11 @@ maps.prototype.setBgFgBlock = function (name, number, x, y, floorId) {
     core.setFlag(vFlag, number);
     core.status[name + "maps"][floorId] = null;
 
-    if (floorId == core.status.floorId)
-        core.drawMap(floorId);
+    if (floorId == core.status.floorId){
+        core.clearMap(name);
+        if (name=='bg') core.drawBg(floorId);
+        else core.drawFg(floorId);
+    }
 }
 
 ////// 重置地图 //////