diff --git a/src/component/legend/LegendModel.ts b/src/component/legend/LegendModel.ts
index b121c94a9a..9c97f802dd 100644
--- a/src/component/legend/LegendModel.ts
+++ b/src/component/legend/LegendModel.ts
@@ -354,6 +354,7 @@ class LegendModel<Ops extends LegendOption = LegendOption> extends ComponentMode
         // which is convinient for user preparing option.
         const rawData = this.get('data') || potentialData;
 
+        const legendNameMap = zrUtil.createHashMap();
         const legendData = zrUtil.map(rawData, function (dataItem) {
             // Can be string or number
             if (zrUtil.isString(dataItem) || zrUtil.isNumber(dataItem)) {
@@ -361,6 +362,11 @@ class LegendModel<Ops extends LegendOption = LegendOption> extends ComponentMode
                     name: dataItem as string
                 };
             }
+            if (legendNameMap.get(dataItem.name)) {
+                // remove legend name duplicate
+                return null;
+            }
+            legendNameMap.set(dataItem.name, true);
             return new Model(dataItem, this, this.ecModel);
         }, this);
 
@@ -368,7 +374,7 @@ class LegendModel<Ops extends LegendOption = LegendOption> extends ComponentMode
          * @type {Array.<module:echarts/model/Model>}
          * @private
          */
-        this._data = legendData;
+        this._data = zrUtil.filter(legendData, item => !!item);
     }
 
     getData() {