diff --git a/common/changes/@visactor/vchart/fix-bug-for-sampling_2026-04-28-11-20.json b/common/changes/@visactor/vchart/fix-bug-for-sampling_2026-04-28-11-20.json
new file mode 100644
index 0000000000..6808a2d5b3
--- /dev/null
+++ b/common/changes/@visactor/vchart/fix-bug-for-sampling_2026-04-28-11-20.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@visactor/vchart",
+      "comment": "fix: bar smapling not work bug. fix#4571",
+      "type": "none"
+    }
+  ],
+  "packageName": "@visactor/vchart"
+}
\ No newline at end of file
diff --git a/packages/vchart/__tests__/unit/chart/bar.test.ts b/packages/vchart/__tests__/unit/chart/bar.test.ts
index f3d0043a94..6d86761aba 100644
--- a/packages/vchart/__tests__/unit/chart/bar.test.ts
+++ b/packages/vchart/__tests__/unit/chart/bar.test.ts
@@ -225,6 +225,34 @@ describe('Bar chart test', () => {
     expect(series.fieldX2).toBeUndefined();
   });
 
+  test('Bar chart with lttb sampling should keep valid bar data', () => {
+    const samplingSpec = {
+      type: 'bar',
+      data: [
+        {
+          id: 'barData',
+          values: [
+            { month: 'Monday', sales: 22 },
+            { month: 'Tuesday', sales: 13 },
+            { month: 'Wednesday', sales: 25 },
+            { month: 'Thursday', sales: 29 },
+            { month: 'Friday', sales: 38 }
+          ]
+        }
+      ],
+      xField: 'month',
+      yField: 'sales',
+      sampling: 'lttb'
+    };
+    chart = createBarChart(samplingSpec);
+
+    const series: BarSeries = chart.getAllSeries()[0] as BarSeries;
+    series.getRegion().setLayoutRect({ width: 500, height: 500 });
+    series.compile();
+
+    expect(series.getData().getProduct()).toHaveLength(5);
+  });
+
   test('stackCornerRadius should build valid clip paths when barMinHeight is enabled', () => {
     const stackSpec = {
       type: 'bar',
diff --git a/packages/vchart/src/series/bar/bar.ts b/packages/vchart/src/series/bar/bar.ts
index 5ef1938b62..cced15b1ed 100644
--- a/packages/vchart/src/series/bar/bar.ts
+++ b/packages/vchart/src/series/bar/bar.ts
@@ -961,7 +961,7 @@ export class BarSeries<T extends IBarSeriesSpec = IBarSeriesSpec> extends Cartes
 
       this._data.setTransform([
         {
-          type: 'sampling',
+          type: 'dataSampling',
           size: this._direction === Direction.horizontal ? height : width,
           factor: this._spec.samplingFactor,
           yfield: this._direction === Direction.horizontal ? fieldsX[0] : fieldsY[0],