diff --git a/src/chart/bar/BarSeries.ts b/src/chart/bar/BarSeries.ts
index eb838c11ff..de03a19eaf 100644
--- a/src/chart/bar/BarSeries.ts
+++ b/src/chart/bar/BarSeries.ts
@@ -53,8 +53,8 @@ interface BarStatesMixin {
 }
 
 export interface BarItemStyleOption<TCbParams = never> extends ItemStyleOption<TCbParams> {
-    // Border radius is not supported for bar on polar
-    borderRadius?: number | number[]
+    // for polar bars, this is used for sector's cornerRadius
+    borderRadius?: (number | string)[] | number | string
 }
 export interface BarDataItemOption extends BarStateOption,
     StatesOptionMixin<BarStateOption, BarStatesMixin>,
diff --git a/src/chart/bar/BarView.ts b/src/chart/bar/BarView.ts
index 5445a1defc..54cc6ec72e 100644
--- a/src/chart/bar/BarView.ts
+++ b/src/chart/bar/BarView.ts
@@ -21,6 +21,8 @@ import Path, {PathProps} from 'zrender/src/graphic/Path';
 import Group from 'zrender/src/graphic/Group';
 import {extend, each, map} from 'zrender/src/core/util';
 import {BuiltinTextPosition} from 'zrender/src/core/types';
+import {SectorProps} from 'zrender/src/graphic/shape/Sector';
+import {RectProps} from 'zrender/src/graphic/shape/Rect';
 import {
     Rect,
     Sector,
@@ -66,6 +68,7 @@ import { warn } from '../../util/log';
 import {createSectorCalculateTextPosition, SectorTextPosition, setSectorTextRotation} from '../../label/sectorLabel';
 import { saveOldStyle } from '../../animation/basicTransition';
 import Element from 'zrender/src/Element';
+import { getSectorCornerRadius } from '../helper/sectorHelper';
 
 const mathMax = Math.max;
 const mathMin = Math.min;
@@ -243,6 +246,9 @@ class BarView extends ChartView {
             if (coord.type === 'cartesian2d') {
                 (bgEl as Rect).setShape('r', barBorderRadius);
             }
+            else {
+                (bgEl as Sector).setShape('cornerRadius', barBorderRadius);
+            }
             bgEls[dataIndex] = bgEl;
             return bgEl;
         };
@@ -334,11 +340,14 @@ class BarView extends ChartView {
                         if (coord.type === 'cartesian2d') {
                             (bgEl as Rect).setShape('r', barBorderRadius);
                         }
+                        else {
+                            (bgEl as Sector).setShape('cornerRadius', barBorderRadius);
+                        }
                         bgEls[newIndex] = bgEl;
                     }
                     const bgLayout = getLayout[coord.type](data, newIndex);
                     const shape = createBackgroundShape(isHorizontalOrRadial, bgLayout, coord);
-                    updateProps(bgEl, { shape }, animationModel, newIndex);
+                    updateProps<RectProps | SectorProps>(bgEl, { shape }, animationModel, newIndex);
                 }
 
                 let el = oldData.getItemGraphicEl(oldIndex) as BarPossiblePath;
@@ -971,7 +980,8 @@ function createPolarPositionMapping(isRadial: boolean)
 
 function updateStyle(
     el: BarPossiblePath,
-    data: SeriesData, dataIndex: number,
+    data: SeriesData,
+    dataIndex: number,
     itemModel: Model<BarDataItemOption>,
     layout: RectLayout | SectorLayout,
     seriesModel: BarSeriesModel,
@@ -981,7 +991,19 @@ function updateStyle(
     const style = data.getItemVisual(dataIndex, 'style');
 
     if (!isPolar) {
-        (el as Rect).setShape('r', itemModel.get(['itemStyle', 'borderRadius']) || 0);
+        const borderRadius = itemModel
+            .get(['itemStyle', 'borderRadius']) as number | number[] || 0;
+        (el as Rect).setShape('r', borderRadius);
+    }
+    else if (!seriesModel.get('roundCap')) {
+        const sectorShape = (el as Sector).shape;
+        const cornerRadius = getSectorCornerRadius(
+            itemModel.getModel('itemStyle'),
+            sectorShape,
+            true
+        );
+        extend(sectorShape, cornerRadius);
+        (el as Sector).setShape(sectorShape);
     }
 
     el.useStyle(style);
diff --git a/src/chart/helper/pieHelper.ts b/src/chart/helper/sectorHelper.ts
similarity index 100%
rename from src/chart/helper/pieHelper.ts
rename to src/chart/helper/sectorHelper.ts
diff --git a/src/chart/pie/PieView.ts b/src/chart/pie/PieView.ts
index 77f5c445e3..cb0e1d6357 100644
--- a/src/chart/pie/PieView.ts
+++ b/src/chart/pie/PieView.ts
@@ -31,7 +31,7 @@ import PieSeriesModel, {PieDataItemOption} from './PieSeries';
 import labelLayout from './labelLayout';
 import { setLabelLineStyle, getLabelLineStatesModels } from '../../label/labelGuideHelper';
 import { setLabelStyle, getLabelStatesModels } from '../../label/labelStyle';
-import { getSectorCornerRadius } from '../helper/pieHelper';
+import { getSectorCornerRadius } from '../helper/sectorHelper';
 import { saveOldStyle } from '../../animation/basicTransition';
 import { getBasicPieLayout } from './pieLayout';
 
diff --git a/src/chart/sunburst/SunburstPiece.ts b/src/chart/sunburst/SunburstPiece.ts
index 6bd8f597e7..f4e1598dc1 100644
--- a/src/chart/sunburst/SunburstPiece.ts
+++ b/src/chart/sunburst/SunburstPiece.ts
@@ -28,7 +28,7 @@ import { PathStyleProps } from 'zrender/src/graphic/Path';
 import { ColorString } from '../../util/types';
 import Model from '../../model/Model';
 import { getECData } from '../../util/innerStore';
-import { getSectorCornerRadius } from '../helper/pieHelper';
+import { getSectorCornerRadius } from '../helper/sectorHelper';
 import {createOrUpdatePatternFromDecal} from '../../util/decal';
 import ExtensionAPI from '../../core/ExtensionAPI';
 import { saveOldStyle } from '../../animation/basicTransition';
diff --git a/test/bar-polar-borderRadius.html b/test/bar-polar-borderRadius.html
new file mode 100644
index 0000000000..2bdc1b0146
--- /dev/null
+++ b/test/bar-polar-borderRadius.html
@@ -0,0 +1,192 @@
+<!DOCTYPE html>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+
+<html>
+    <head>
+        <meta charset="utf-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+        <script src="lib/simpleRequire.js"></script>
+        <script src="lib/config.js"></script>
+        <script src="lib/jquery.min.js"></script>
+        <script src="lib/facePrint.js"></script>
+        <script src="lib/testHelper.js"></script>
+        <!-- <script src="ut/lib/canteen.js"></script> -->
+        <link rel="stylesheet" href="lib/reset.css" />
+    </head>
+    <body>
+        <style>
+        </style>
+
+
+
+        <div id="main0"></div>
+        <div id="main1"></div>
+        <div id="main2"></div>
+
+
+
+        <script>
+            require([
+                'echarts',
+                // 'map/js/china',
+                // './data/nutrients.json'
+            ], function (echarts) {
+                var option;
+
+                option = {
+                    angleAxis: {
+                        type: 'category',
+                        data: ['a', 'b', 'c'],
+                        z: 10
+                    },
+                    tooltip: {
+                    },
+                    radiusAxis: {
+                    },
+                    polar: {
+                        radius: [50, 150]
+                    },
+                    series: [{
+                        type: 'bar',
+                        data: [2, -1, 3],
+                            showBackground: true,
+                            backgroundStyle: {
+                                borderRadius: [5, 10, 20, 30]
+                            },
+                        itemStyle: {
+                            borderRadius: [5, 10, 20, 30]
+                        },
+                        coordinateSystem: 'polar'
+                    }]
+                };
+
+                var chart = testHelper.create(echarts, 'main0', {
+                    title: [
+                        'borderRadius: [5, 10, 20, 30]'
+                    ],
+                    option: option,
+                    // height: 300,
+                    // recordCanvas: true,
+                });
+            });
+            </script>
+
+            <script>
+                require([
+                    'echarts',
+                    // 'map/js/china',
+                    // './data/nutrients.json'
+                ], function (echarts) {
+                    var option;
+
+                    option = {
+                        angleAxis: {
+                            type: 'category',
+                            data: ['a', 'b', 'c'],
+                            z: 10
+                        },
+                        tooltip: {
+                        },
+                        radiusAxis: {
+                        },
+                        polar: {
+                            radius: [50, 150]
+                        },
+                        series: [{
+                            type: 'bar',
+                            data: [2, -1, 3],
+                            showBackground: true,
+                            backgroundStyle: {
+                                borderRadius: [10, 20]
+                            },
+                            itemStyle: {
+                                borderRadius: [10, 20]
+                            },
+                            coordinateSystem: 'polar'
+                        }]
+                    };
+
+                    var chart = testHelper.create(echarts, 'main1', {
+                        title: [
+                            'borderRadius: [10, 20]'
+                        ],
+                        option: option,
+                        // height: 300,
+                        // recordCanvas: true,
+                    });
+                });
+            </script>
+
+            <script>
+                require([
+                    'echarts',
+                    // 'map/js/china',
+                    // './data/nutrients.json'
+                ], function (echarts) {
+                    var option;
+
+                    option = {
+                        angleAxis: {
+                            type: 'category',
+                            data: ['a', 'b', 'c'],
+                            z: 10
+                        },
+                        tooltip: {
+                        },
+                        radiusAxis: {
+                        },
+                        polar: {
+                            radius: [50, 150]
+                        },
+                        series: [{
+                            type: 'bar',
+                            data: [{
+                                value: 2,
+                                itemStyle: {
+                                    borderRadius: [20, 5]
+                                }
+                            }, -1, 3],
+                            showBackground: true,
+                            backgroundStyle: {
+                                borderRadius: [20, 5]
+                            },
+                            itemStyle: {
+                                borderRadius: 10
+                            },
+                            coordinateSystem: 'polar'
+                        }]
+                    };
+
+                    var chart = testHelper.create(echarts, 'main2', {
+                        title: [
+                            'borderRadius: 10',
+                            'value 2 borderRadius: [20, 5]'
+                        ],
+                        option: option,
+                        // height: 300,
+                        // recordCanvas: true,
+                    });
+                });
+            </script>
+
+
+    </body>
+</html>