diff --git a/packages/griffith-utils/src/__tests__/math.spec.ts b/packages/griffith-utils/src/__tests__/math.spec.ts
deleted file mode 100644
index 3e5a78e2..00000000
--- a/packages/griffith-utils/src/__tests__/math.spec.ts
+++ /dev/null
@@ -1,66 +0,0 @@
-import {getGCD, reduce} from '../math'
-
-describe('getGCD', () => {
-  it('should get greatest common divisor', () => {
-    expect(getGCD(1, 2)).toBe(1)
-    expect(getGCD(2, 4)).toBe(2)
-    expect(getGCD(18, 27)).toBe(9)
-    expect(getGCD(28, 21)).toBe(7)
-  })
-
-  it('should always get positive number', () => {
-    expect(getGCD(18, -27)).toBe(9)
-    expect(getGCD(-28, 21)).toBe(7)
-  })
-
-  it('should return the other one if either param is zero', () => {
-    expect(getGCD(12345, 0)).toBe(12345)
-    expect(getGCD(0, 100)).toBe(100)
-    expect(getGCD(0, 0)).toBe(0)
-  })
-
-  it('should throw if either param is not a interger', () => {
-    expect(() => getGCD(1, 1.234)).toThrow()
-    expect(() => getGCD(1, Infinity)).toThrow()
-    expect(() => getGCD(1, NaN)).toThrow()
-
-    expect(() => getGCD(1, 'foo')).toThrow()
-    expect(() => getGCD(1, {})).toThrow()
-
-    expect(() => getGCD(1, null)).toThrow()
-    expect(() => getGCD(1, undefined)).toThrow()
-  })
-})
-
-describe('reduce', () => {
-  it('should reduce two numbers', () => {
-    expect(reduce(1, 2)).toEqual([1, 2])
-    expect(reduce(2, 4)).toEqual([1, 2])
-    expect(reduce(18, 27)).toEqual([2, 3])
-    expect(reduce(28, 21)).toEqual([4, 3])
-  })
-
-  it('should reduce negetive numbers correctly', () => {
-    expect(reduce(-2, -4)).toEqual([-1, -2])
-    expect(reduce(-18, 27)).toEqual([-2, 3])
-    expect(reduce(28, -21)).toEqual([4, -3])
-  })
-
-  it('should thorw if either param is zero', () => {
-    expect(() => reduce(12345, 0)).toThrow()
-    expect(() => reduce(0, 100)).toThrow()
-    expect(() => reduce(0, 0)).toThrow()
-  })
-
-  it('should throw if either param is not interger', () => {
-    expect(() => reduce(1, 1.234)).toThrow()
-    expect(() => reduce(1, Infinity)).toThrow()
-    expect(() => reduce(1, NaN)).toThrow()
-
-    expect(() => reduce(1, 'foo')).toThrow()
-    expect(() => reduce(1, {})).toThrow()
-
-    expect(() => reduce(1, null)).toThrow()
-    expect(() => reduce(1, undefined)).toThrow()
-  })
-})
diff --git a/packages/griffith-utils/src/index.ts b/packages/griffith-utils/src/index.ts
index 4874aab2..f1b9befd 100644
--- a/packages/griffith-utils/src/index.ts
+++ b/packages/griffith-utils/src/index.ts
@@ -2,5 +2,4 @@ export {default as logger} from './logger'
 export {default as ua} from './ua'
 export {default as isMSESupported} from './isMSESupported'
 export {default as isHlsNativeSupported} from './isHlsNativeSupported'
-export {getGCD, reduce} from './math'
 export {default as sequence} from './sequence'
diff --git a/packages/griffith-utils/src/math.ts b/packages/griffith-utils/src/math.ts
deleted file mode 100644
index 652bd1f1..00000000
--- a/packages/griffith-utils/src/math.ts
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * 获得最大公约数
- */
-export function getGCD(a: number, b: number): number {
-  if (!Number.isInteger(a) || !Number.isInteger(b)) {
-    throw new Error('params must be interger number')
-  }
-  if (a === 0) {
-    return Math.abs(b)
-  }
-  if (b === 0) {
-    return Math.abs(a)
-  }
-  return getGCD(b, a % b)
-}
-
-/**
- * 约分
- */
-export function reduce(a: number, b: number) {
-  if (a === 0 || b === 0) {
-    throw new Error('params must not be zero')
-  }
-  const gcd = getGCD(a, b)
-  return [a / gcd, b / gcd]
-}
diff --git a/packages/griffith/src/contexts/PositionProvider.tsx b/packages/griffith/src/contexts/PositionProvider.tsx
index c072e133..56a29118 100644
--- a/packages/griffith/src/contexts/PositionProvider.tsx
+++ b/packages/griffith/src/contexts/PositionProvider.tsx
@@ -1,6 +1,5 @@
 import React, {useRef, useEffect, useState, useMemo} from 'react'
 import {css} from 'aphrodite/no-important'
-import {reduce} from 'griffith-utils'
 import useHandler from '../hooks/useHandler'
 import usePrevious from '../hooks/usePrevious'
 import listenResize from '../utils/listenResize'
@@ -34,8 +33,7 @@ const PositionProvider: React.FC<Props> = ({children}) => {
     if (!videoWidth || !videoHeight) {
       return
     }
-    const [width, height] = reduce(videoWidth, videoHeight)
-    setHelperImageSrc(createHolderImageSrc(width, height))
+    setHelperImageSrc(createHolderImageSrc(videoWidth, videoHeight))
   })
 
   const updateIsFullWidth = useHandler(() => {