diff --git a/src/field/index.js b/src/field/index.js
index 819c9eec4..81d01eb12 100644
--- a/src/field/index.js
+++ b/src/field/index.js
@@ -1,6 +1,6 @@
 // Utils
-import { formatNumber } from './utils';
 import { preventDefault } from '../utils/dom/event';
+import { formatNumber } from '../utils/format/number';
 import { resetScroll } from '../utils/dom/reset-scroll';
 import {
   createNamespace,
diff --git a/src/field/utils.ts b/src/field/utils.ts
deleted file mode 100644
index d9fe3de4d..000000000
--- a/src/field/utils.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-export function formatNumber(value: string, allowDot: boolean) {
-  if (allowDot) {
-    const dotIndex = value.indexOf('.');
-
-    if (dotIndex > -1) {
-      value =
-        value.slice(0, dotIndex + 1) + value.slice(dotIndex).replace(/\./g, '');
-    }
-  } else {
-    value = value.split('.')[0];
-  }
-
-  const regExp = allowDot ? /[^0-9.]/g : /\D/g;
-
-  return value.replace(regExp, '');
-}
diff --git a/src/stepper/index.js b/src/stepper/index.js
index 2868fae77..e06b13940 100644
--- a/src/stepper/index.js
+++ b/src/stepper/index.js
@@ -1,8 +1,8 @@
 import { createNamespace, isDef, addUnit } from '../utils';
 import { resetScroll } from '../utils/dom/reset-scroll';
 import { preventDefault } from '../utils/dom/event';
+import { formatNumber } from '../utils/format/number';
 import { FieldMixin } from '../mixins/field';
-import { formatNumber } from '../field/utils';
 
 const [createComponent, bem] = createNamespace('stepper');
 
diff --git a/src/utils/format/number.ts b/src/utils/format/number.ts
index 5401d691b..4a6004ad5 100644
--- a/src/utils/format/number.ts
+++ b/src/utils/format/number.ts
@@ -1,3 +1,27 @@
 export function range(num: number, min: number, max: number): number {
   return Math.min(Math.max(num, min), max);
 }
+
+function trimExtraChar(value: string, char: string, regExp: RegExp) {
+  const index = value.indexOf(char);
+
+  if (index > -1) {
+    return value.slice(0, index + 1) + value.slice(index).replace(regExp, '');
+  }
+
+  return value;
+}
+
+export function formatNumber(value: string, allowDot?: boolean) {
+  if (allowDot) {
+    value = trimExtraChar(value, '.', /\./g);
+  } else {
+    value = value.split('.')[0];
+  }
+
+  value = trimExtraChar(value, '-', /-/g);
+
+  const regExp = allowDot ? /[^-0-9.]/g : /[^-0-9]/g;
+
+  return value.replace(regExp, '');
+}
diff --git a/src/utils/test/index.spec.js b/src/utils/test/index.spec.js
index 64fe13786..8ce27efbe 100644
--- a/src/utils/test/index.spec.js
+++ b/src/utils/test/index.spec.js
@@ -8,6 +8,7 @@ import { isMobile } from '../validate/mobile';
 import { isNumeric } from '../validate/number';
 import { isAndroid } from '../validate/system';
 import { camelize } from '../format/string';
+import { formatNumber } from '../format/number';
 
 test('deepClone', () => {
   const a = { foo: 0 };
@@ -95,3 +96,21 @@ test('isNumeric', () => {
   expect(isNumeric('abc')).toBeFalsy();
   expect(isNumeric('1b2')).toBeFalsy();
 });
+
+test('formatNumber', () => {
+  expect(formatNumber('abc')).toEqual('');
+  expect(formatNumber('1.2')).toEqual('1');
+  expect(formatNumber('abc1.2')).toEqual('1');
+  expect(formatNumber('123.4.')).toEqual('123');
+
+  // with dot
+  expect(formatNumber('abc', true)).toEqual('');
+  expect(formatNumber('1.2', true)).toEqual('1.2');
+  expect(formatNumber('abc1.2', true)).toEqual('1.2');
+  expect(formatNumber('123.4.', true)).toEqual('123.4');
+
+  // minus
+  expect(formatNumber('-1.2')).toEqual('-1');
+  expect(formatNumber('-1.2', true)).toEqual('-1.2');
+  expect(formatNumber('-1.2-', true)).toEqual('-1.2');
+});