diff --git a/src/component/tooltip/TooltipView.ts b/src/component/tooltip/TooltipView.ts
index d5bf5d8f21..63d879b9e8 100644
--- a/src/component/tooltip/TooltipView.ts
+++ b/src/component/tooltip/TooltipView.ts
@@ -681,6 +681,7 @@ class TooltipView extends ComponentView {
         params.marker = markupStyleCreator.makeTooltipMarker(
             'item', convertToColorString(params.color), renderMode
         );
+        params.dimensionIndex = dispatcher.__dimIdx;
 
         const seriesTooltipResult = normalizeTooltipFormatResult(
             dataModel.formatTooltip(dataIndex, false, dataType)
diff --git a/src/core/echarts.ts b/src/core/echarts.ts
index 190e385634..44a8ea2cfb 100644
--- a/src/core/echarts.ts
+++ b/src/core/echarts.ts
@@ -1067,14 +1067,15 @@ class ECharts extends Eventful<ECEventDefinition> {
             const handler = (e: ElementEvent) => {
                 const ecModel = this.getModel();
                 const el = e.target;
+                let dispatcher: ECElement | undefined;
                 let params: ECElementEvent;
                 const isGlobalOut = eveName === 'globalout';
                 // no e.target when 'globalout'.
                 if (isGlobalOut) {
                     params = {} as ECElementEvent;
                 }
-                else {
-                    el && findEventDispatcher(el, (parent) => {
+                else if (el) {
+                    dispatcher = findEventDispatcher(el, (parent) => {
                         const ecData = getECData(parent);
                         if (ecData && ecData.dataIndex != null) {
                             const dataModel = ecData.dataModel || ecModel.getSeriesByIndex(ecData.seriesIndex);
@@ -1131,6 +1132,7 @@ class ECharts extends Eventful<ECEventDefinition> {
 
                     params.event = e;
                     params.type = eveName;
+                    params.dimensionIndex = dispatcher ? dispatcher.__dimIdx : undefined;
 
                     (this._$eventProcessor as ECEventProcessor).eventInfo = {
                         targetEl: el,
diff --git a/src/util/types.ts b/src/util/types.ts
index 1d085c198f..a1ae9d582b 100644
--- a/src/util/types.ts
+++ b/src/util/types.ts
@@ -137,6 +137,11 @@ export interface ECElement extends Element {
      * Force disable morphing
      */
     disableMorphing?: boolean
+
+    /**
+     * From RadarSymbol
+     */
+    __dimIdx?: number;
 }
 
 export interface DataHost {