diff --git a/src/data/List.js b/src/data/List.js
index 1066272e4b839921f8a5070f87a88a86e52c465d..b9d2e116f53f202bd963f09c3f01ac7fdfd1e41f 100644
--- a/src/data/List.js
+++ b/src/data/List.js
@@ -149,17 +149,11 @@ define(function(require) {
             }
         },
 
-        clone: function (dataIndex) {
-            var entry = new Entry(this.option, this.parentModel, dataIndex);
+        clone: function (dataIndex, independentVar, dependentVar) {
+            var entry = new Entry(this.option, this.parentModel, dataIndex, independentVar, dependentVar);
             entry.name = this.name;
             entry.stackedOn = this.stackedOn;
 
-            for (var i = 0; i < POSSIBLE_DIMENSIONS.length; i++) {
-                var key = POSSIBLE_DIMENSIONS[i] + 'Index';
-                if (this.hasOwnProperty(key)) {
-                    entry[key] = this[key];
-                }
-            }
             return entry;
         }
     });
@@ -272,10 +266,11 @@ define(function(require) {
          */
         map: function (cb, context) {
             var ret = [];
+            var elements = this.elements;
             context = context || this;
-            this.each(function (item, idx) {
-                ret.push(cb && cb.call(context, item));
-            }, context);
+            for (var i = 0; i < elements.length; i++) {
+                ret.push(cb && cb.call(context, elements[i], i));
+            }
             return ret;
         },
 
@@ -321,9 +316,26 @@ define(function(require) {
          */
         clone: function () {
             var list = new List(this.dimensions, this.value);
-            list.elements = zrUtil.map(this.elements, function (el, i) {
-                return el.clone(i);
-            });
+            var elements = this.elements;
+            for (var i = 0; i < elements.length; i++) {
+                list.elements.push(elements[i].clone(i, this.dimensions, this.value));
+            }
+            return list;
+        },
+
+        /**
+         * Clone a new list
+         */
+        cloneShallow: function () {
+            var list = new List(this.dimensions, this.value);
+            list.elements = this.elements.slice();
+            // FIXME
+            // All list have the same entries may have problem
+            // When processor modify the data besides data index
+            // Reset data index
+            for (var i = 0; i < list.elements.length; i++) {
+                list.elements[i].setDataIndex(i);
+            }
             return list;
         }
     };
@@ -436,7 +448,7 @@ define(function(require) {
         // Normalize data
         zrUtil.each(data, function (dataItem, idx) {
             var entry = list.add(dataItem, seriesModel);
-            if (! dataItem.name) {
+            if (!dataItem.name) {
                 entry.name = categoryAxisData && categoryAxisData[idx] || idx;
             }
             return entry;
diff --git a/src/model/Series.js b/src/model/Series.js
index c10cdc1c90d2dfc494f3822804cca2c1726bd19c..330f26e075b80e257dd933b1cd2b2dfb3b8f63db 100644
--- a/src/model/Series.js
+++ b/src/model/Series.js
@@ -29,7 +29,6 @@ define(function(require) {
         defaultOption: null,
 
         init: function (option, parentModel, ecModel, dependentModels, seriesIndex) {
-
             /**
              * @type {number}
              */
@@ -49,7 +48,7 @@ define(function(require) {
              */
             this._data = this.getInitialData(option, ecModel);
 
-            this._dataBeforeProcessing = this._data.clone();
+            this._dataBeforeProcessing = this._data.cloneShallow();
         },
 
         mergeDefaultAndTheme: function (option, ecModel) {
@@ -74,8 +73,9 @@ define(function(require) {
             return this._data;
         },
 
+        // PENDING Clear visual and layout ?
         restoreData: function () {
-            this._data = this._dataBeforeProcessing.clone();
+            this._data = this._dataBeforeProcessing.cloneShallow();
         }
     });