diff --git a/__tests__/unit/plots/scatter/size-spec.ts b/__tests__/unit/plots/scatter/size-spec.ts
index e9c6d7e8c0..0025efff00 100644
--- a/__tests__/unit/plots/scatter/size-spec.ts
+++ b/__tests__/unit/plots/scatter/size-spec.ts
@@ -97,4 +97,33 @@ describe('scatter', () => {
 
     scatter.destroy();
   });
+
+  it('size: default', () => {
+    const scatter = new Scatter(createDiv(), {
+      width: 400,
+      height: 300,
+      appendPadding: 10,
+      data,
+      xField: 'weight',
+      yField: 'height',
+      sizeField: 'weight',
+    });
+
+    scatter.render();
+
+    const geometry = scatter.chart.geometries[0];
+    const elements = geometry.elements;
+    const sizeArr = [];
+    elements.forEach((ele) => {
+      sizeArr.push(ele.getModel().size);
+    });
+    sizeArr.sort((a, b) => a - b);
+
+    // @ts-ignore
+    expect(elements.length).toBe(507);
+    expect(sizeArr[0] > 0).toBeTruthy();
+    expect(sizeArr[0]).not.toEqual(sizeArr[sizeArr.length - 1]);
+
+    scatter.destroy();
+  });
 });
diff --git a/src/plots/scatter/adaptor.ts b/src/plots/scatter/adaptor.ts
index 2aef522167..9bd8619cbc 100644
--- a/src/plots/scatter/adaptor.ts
+++ b/src/plots/scatter/adaptor.ts
@@ -1,4 +1,4 @@
-import { isBoolean } from '@antv/util';
+import { isBoolean, isArray } from '@antv/util';
 import { Params } from '../../core/adaptor';
 import { flow, deepAssign } from '../../utils';
 import { point } from '../../adaptor/geometries';
@@ -29,10 +29,15 @@ export function transformOptions(options: ScatterOptions): ScatterOptions {
  */
 function geometry(params: Params<ScatterOptions>): Params<ScatterOptions> {
   const { chart, options } = params;
-  const { data, type, color, shape, size, pointStyle, shapeField, colorField, xField, yField, sizeField } = options;
+  const { data, type, color, shape, pointStyle, shapeField, colorField, xField, yField, sizeField } = options;
+  let { size } = options;
 
   let { tooltip } = options;
 
+  if (sizeField && !isArray(size)) {
+    size = [2, 8];
+  }
+
   if (tooltip && !tooltip.fields) {
     tooltip = {
       ...tooltip,