diff --git a/src/modules/table.js b/src/modules/table.js
index 1f657d7b..088fae2d 100644
--- a/src/modules/table.js
+++ b/src/modules/table.js
@@ -154,6 +154,8 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
 
   var DATA_MOVE_NAME = 'LAY_TABLE_MOVE_DICT';
 
+  var resizeObserver = lay._createResizeObserver(MOD_NAME);
+
   // thead 区域模板
   var TPL_HEADER = function(options){
     var rowCols = '{{#var colspan = layui.type(item2.colspan2) === \'number\' ? item2.colspan2 : item2.colspan; if(colspan){}} colspan="{{=colspan}}"{{#} if(item2.rowspan){}} rowspan="{{=item2.rowspan}}"{{#}}}';
@@ -288,6 +290,7 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
     var that = this;
     that.index = ++table.index;
     that.config = $.extend({}, that.config, table.config, options);
+    that.unobserveResize = $.noop;
     that.render();
   };
 
@@ -318,6 +321,11 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
       options.elem.attr('id') || that.index
     );
 
+    // 重复 render 时清理旧实例
+    if(thisTable.that[id] && thisTable.that[id] !== that){
+      thisTable.that[id].dispose();
+    }
+
     thisTable.that[id] = that; // 记录当前实例对象
     thisTable.config[id] = options; // 记录当前实例配置项
 
@@ -460,7 +468,7 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
 
     that.pullData(that.page); // 请求数据
     that.events(); // 事件
-    that.autoResize();
+    that.observeResize(); // 观察尺寸变化
   };
 
   // 根据列类型，定制化参数
@@ -2928,13 +2936,16 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
     }
   };
 
-  Class.prototype.createResizeObserver = function(){
+  Class.prototype.dispose = function(){
     var that = this;
-    if(that.resizeObserver){
-      that.resizeObserver.disconnect();
-      that.resizeObserver = null;
+
+    that.unobserveResize();
+    for (const propName in that) {
+      if(lay.hasOwn(that, propName) && propName !== 'config'){
+        that[propName] = null;
+      }
     }
-    that.resizeObserver = lay._createResizeObserver('table-' + that.config.id);
+
   }
 
   Class.prototype.syncFixedColHeight = function(){
@@ -2945,13 +2956,12 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
     var rightTrs = that.layFixRight.find('>.layui-table-body>table>tbody>tr');
     var mainTrs = tableElem.find('>tbody>tr');
 
-    // 批量获取高度
+    // 批量获取主表格行高，设置高度以优化性能
     var heights = [];
     mainTrs.each(function() {
       heights.push(that.getElementSize(this).height);
     });
 
-    // 批量设置高度
     if (leftTrs.length) {
       leftTrs.each(function(i) {
         if (heights[i]) {
@@ -2969,27 +2979,39 @@ layui.define(['lay', 'i18n', 'laytpl', 'laypage', 'form', 'util'], function(expo
     }
   }
 
-  Class.prototype.autoResize = function(){
+  Class.prototype.observeResize = function(){
     var that = this;
-
-    that.createResizeObserver();
     
-    if(!that.resizeObserver) return;
+    if(!resizeObserver) return;
 
+    that.unobserveResize();
+
+    var el = that.elem[0];
+    var tableEl = that.layMain.children('table')[0];
     // 显示或隐藏时重置列宽
-    that.resizeObserver.observe(that.elem[0], $.proxy(that.resize, that));
+    resizeObserver.observe(el, $.proxy(that.resize, that));
 
     // 同步固定列表格和主表格高度
     var lineStyle = that.config.lineStyle;
     var isAutoHeight = lineStyle && (/\bheight\s*:\s*auto\b/g.test(lineStyle) || lineStyle.indexOf('max-height') !== -1);
-    that.needSyncFixedColHeight = (that.layBody.length > 1) && (that.config.syncFixedRowHeight || (that.config.syncFixedRowHeight !== false && isAutoHeight));
+    // 只重载数据时需要主动同步高度，因为 tbody 大小可能不变
+    var needSyncFixedColHeight = that.needSyncFixedColHeight = (that.layBody.length > 1) && (that.config.syncFixedRowHeight || (that.config.syncFixedRowHeight !== false && isAutoHeight));
 
-    if(that.needSyncFixedColHeight){
-      that.resizeObserver.observe(
-        that.layMain.children('table')[0], 
+    if(needSyncFixedColHeight){
+      resizeObserver.observe(
+        tableEl, 
         $.proxy(that.syncFixedColHeight, that)
       );
     }
+
+    that.unobserveResize = function(){
+      resizeObserver.unobserve(el);
+      if(needSyncFixedColHeight){
+        resizeObserver.unobserve(tableEl);
+      }
+
+      that.unobserveResize = $.noop;
+    }
   };
 
   // 全局事件