diff --git a/docs/zh-CN/components/form/input-number.md b/docs/zh-CN/components/form/input-number.md
index b7c1c6082..2b7521df1 100755
--- a/docs/zh-CN/components/form/input-number.md
+++ b/docs/zh-CN/components/form/input-number.md
@@ -24,6 +24,37 @@ order: 32
 }
 ```
 
+## 设置精度
+
+`precision` 设置数字的显示精度，一般需要配合`step`属性使用，以实现细粒度调整。
+
+```schema: scope="body"
+{
+    "type": "form",
+    "api": "/api/mock2/form/saveForm",
+    "data": {
+        "number2": 3.1234
+    },
+    "body": [
+        {
+            "type": "input-number",
+            "name": "number1",
+            "label": "数字",
+            "precision": 2,
+            "step": 0.01,
+            "value": 2.98786
+        },
+        {
+            "type": "input-number",
+            "name": "number2",
+            "label": "数字2",
+            "precision": 3,
+            "step": 0.001
+        }
+    ]
+}
+```
+
 ## 前后缀、千分分隔
 
 ```schema: scope="body"
diff --git a/packages/amis-ui/src/components/NumberInput.tsx b/packages/amis-ui/src/components/NumberInput.tsx
index 18db2e173..da4d8d951 100644
--- a/packages/amis-ui/src/components/NumberInput.tsx
+++ b/packages/amis-ui/src/components/NumberInput.tsx
@@ -104,7 +104,7 @@ export class NumberInput extends React.Component<NumberProps, any> {
     }
     const target = getMiniDecimal(val).add(stepDecimal.toString());
     const getPrecision = (numStr: string) => {
-      if (precision! >= 0) {
+      if (precision != null && precision >= 0) {
         return precision;
       }
       return Math.max(
diff --git a/packages/amis/__tests__/renderers/Form/__snapshots__/number.test.tsx.snap b/packages/amis/__tests__/renderers/Form/__snapshots__/number.test.tsx.snap
index 504132fdd..44b19448e 100644
--- a/packages/amis/__tests__/renderers/Form/__snapshots__/number.test.tsx.snap
+++ b/packages/amis/__tests__/renderers/Form/__snapshots__/number.test.tsx.snap
@@ -459,6 +459,165 @@ exports[`Renderer:number with borderMode 2`] = `
 </div>
 `;
 
+exports[`Renderer:number with precision and default value 1`] = `
+<div>
+  <div
+    class="cxd-Panel cxd-Panel--default cxd-Panel--form"
+    style="position: relative;"
+  >
+    <div
+      class="cxd-Panel-heading"
+    >
+      <h3
+        class="cxd-Panel-title"
+      >
+        <span
+          class="cxd-TplField"
+        >
+          <span>
+            表单
+          </span>
+        </span>
+      </h3>
+    </div>
+    <div
+      class="cxd-Panel-body"
+    >
+      <form
+        class="cxd-Form cxd-Form--normal"
+        novalidate=""
+      >
+        <input
+          style="display: none;"
+          type="submit"
+        />
+        <div
+          class="cxd-Form-item cxd-Form-item--normal"
+          data-role="form-item"
+        >
+          <label
+            class="cxd-Form-label"
+          >
+            <span>
+              <span
+                class="cxd-TplField"
+              >
+                <span>
+                  number
+                </span>
+              </span>
+            </span>
+          </label>
+          <div
+            class="cxd-NumberControl cxd-Form-control"
+          >
+            <div
+              class="cxd-Number cxd-Number--borderFull"
+            >
+              <div
+                class="cxd-Number-handler-wrap"
+              >
+                <span
+                  aria-disabled="false"
+                  aria-label="Increase Value"
+                  class="cxd-Number-handler cxd-Number-handler-up"
+                  role="button"
+                  unselectable="on"
+                >
+                  <span
+                    class="cxd-Number-handler-up-inner"
+                    unselectable="on"
+                  />
+                </span>
+                <span
+                  aria-disabled="false"
+                  aria-label="Decrease Value"
+                  class="cxd-Number-handler cxd-Number-handler-down"
+                  role="button"
+                  unselectable="on"
+                >
+                  <span
+                    class="cxd-Number-handler-down-inner"
+                    unselectable="on"
+                  />
+                </span>
+              </div>
+              <div
+                class="cxd-Number-input-wrap"
+              >
+                <input
+                  aria-valuenow="2.99"
+                  autocomplete="off"
+                  class="cxd-Number-input"
+                  role="spinbutton"
+                  step="0.01"
+                  value="2.99"
+                />
+              </div>
+            </div>
+          </div>
+        </div>
+      </form>
+    </div>
+    <div
+      class="cxd-Panel-footerWrap"
+    >
+      <div
+        class="cxd-Panel-btnToolbar cxd-Panel-footer"
+      >
+        <button
+          class="cxd-Button cxd-Button--primary"
+          type="submit"
+        >
+          <span>
+            提交
+          </span>
+        </button>
+      </div>
+    </div>
+    <div
+      class="resize-sensor"
+      style="position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; overflow: scroll; z-index: -1; visibility: hidden;"
+    >
+      
+  
+      <div
+        class="resize-sensor-expand"
+        style="position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: scroll; z-index: -1; visibility: hidden;"
+      >
+        
+    
+        <div
+          style="position: absolute; left: 0px; top: 0px; width: 10px; height: 10px;"
+        />
+        
+  
+      </div>
+      
+  
+      <div
+        class="resize-sensor-shrink"
+        style="position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: scroll; z-index: -1; visibility: hidden;"
+      >
+        
+    
+        <div
+          style="position: absolute; left: 0; top: 0; width: 200%; height: 200%"
+        />
+        
+  
+      </div>
+      
+  
+      <div
+        class="resize-sensor-appear"
+        style="position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: scroll; z-index: -1; visibility: hidden;animation-name: apearSensor; animation-duration: 0.2s;"
+      />
+    </div>
+  </div>
+</div>
+`;
+
 exports[`Renderer:number with prefix & suffix & kilobitSeparator 1`] = `
 <div>
   <div
diff --git a/packages/amis/__tests__/renderers/Form/number.test.tsx b/packages/amis/__tests__/renderers/Form/number.test.tsx
index 2a378e15b..33932df93 100644
--- a/packages/amis/__tests__/renderers/Form/number.test.tsx
+++ b/packages/amis/__tests__/renderers/Form/number.test.tsx
@@ -1,4 +1,15 @@
-import React = require('react');
+/**
+ * 组件名称：InputNumber 数字输入框
+ * 单测内容：
+ * 1. 默认值，输入数字
+ * 2. 最小值 & 最大值
+ * 3. 前后缀 &千分分隔
+ * 4. 单位
+ * 5. 默认值的精度
+ * 6. 加强版输入框
+ * 7. 边框模式：无边框 & 半边框
+ */
+
 import {render, fireEvent, waitFor} from '@testing-library/react';
 import '../../../src';
 import {render as amisRender} from '../../../src';
@@ -169,6 +180,17 @@ test('Renderer:number with unitOptions', async () => {
   expect(container).toMatchSnapshot();
 });
 
+test('Renderer:number with precision and default value', async () => {
+  const {input, wrap, container, getByText} = await setup({
+    precision: 2,
+    step: 0.01,
+    value: 2.98786
+  });
+
+  expect(input.value).toBe('2.99');
+  expect(container).toMatchSnapshot();
+});
+
 test('Renderer:number with step & precision & displayMode & keyboard', async () => {
   const {input, wrap, container, getByText} = await setup({
     step: 3,
diff --git a/packages/amis/src/renderers/Form/InputNumber.tsx b/packages/amis/src/renderers/Form/InputNumber.tsx
index 030c237c9..abf18612e 100644
--- a/packages/amis/src/renderers/Form/InputNumber.tsx
+++ b/packages/amis/src/renderers/Form/InputNumber.tsx
@@ -1,12 +1,19 @@
 import React from 'react';
-import {FormItem, FormControlProps, FormBaseControl} from 'amis-core';
+import {toFixed} from 'rc-input-number/lib/utils/MiniDecimal';
+import {FormItem, FormControlProps} from 'amis-core';
 import cx from 'classnames';
-import {filter} from 'amis-core';
 import {NumberInput, Select} from 'amis-ui';
-import {autobind, createObject} from 'amis-core';
-import {normalizeOptions, Option} from 'amis-core';
-import {PlainObject, ActionObject} from 'amis-core';
-import {BaseSchema, FormBaseControlSchema} from '../../Schema';
+import {
+  filter,
+  autobind,
+  createObject,
+  normalizeOptions,
+  Option,
+  PlainObject,
+  ActionObject
+} from 'amis-core';
+import {FormBaseControlSchema} from '../../Schema';
+
 /**
  * 数字输入框
  * 文档：https://baidu.gitee.io/amis/docs/components/form/number
@@ -131,10 +138,25 @@ export default class NumberControl extends React.Component<
 
   constructor(props: NumberProps) {
     super(props);
+
     this.handleChange = this.handleChange.bind(this);
     this.handleChangeUnit = this.handleChangeUnit.bind(this);
     const unit = this.getUnit();
     const unitOptions = normalizeOptions(props.unitOptions);
+    const {formItem, setPrinstineValue, precision, value} = props;
+    const normalizedPrecision = this.filterNum(precision);
+
+    /** 如果设置了precision需要处理入参value的精度 */
+    if (formItem && value != null && normalizedPrecision != null) {
+      const normalizedValue = toFixed(
+        value.toString(),
+        '.',
+        normalizedPrecision
+      );
+
+      setPrinstineValue(parseFloat(normalizedValue));
+    }
+
     this.state = {unit, unitOptions};
   }
 
@@ -282,9 +304,7 @@ export default class NumberControl extends React.Component<
       keyboard,
       displayMode
     } = this.props;
-
     let precisionProps: any = {};
-
     const finalPrecision = this.filterNum(precision);
     if (typeof finalPrecision === 'number') {
       precisionProps.precision = finalPrecision;