diff --git a/src/ui/editor/MakeLine.vue b/src/ui/editor/MakeLine.vue
index 9186a75..2368591 100644
--- a/src/ui/editor/MakeLine.vue
+++ b/src/ui/editor/MakeLine.vue
@@ -52,16 +52,28 @@ export default {
     },
     listenerChange(list, index, cb) {
       const activeStyle = list[index].style;
+      const screenWidth = this.$parent.$el.offsetWidth
+      const screenHeight = this.$parent.$el.offsetHeight
       // 上边缘
       if (Math.abs(activeStyle.top) <= value) {
         activeStyle.top = 0;
         cb && cb(list[index], index);
       }
+      // 下边缘
+      if (Math.abs(activeStyle.top+activeStyle.height - screenHeight) <= value) {
+        activeStyle.top = screenHeight - activeStyle.height;
+        cb && cb(list[index], index);
+      }
       // 左边缘
       if (Math.abs(activeStyle.left) <= value) {
         activeStyle.left = 0;
         cb && cb(list[index], index);
       }
+      // 右边缘
+      if (Math.abs(activeStyle.left+activeStyle.width-screenWidth) <= value) {
+        activeStyle.left = screenWidth - activeStyle.width;
+        cb && cb(list[index], index);
+      }
       if (list.length==1) {
         return
       }