diff --git a/src/hooks/useLine.js b/src/hooks/useLine.js
index fcf14312..9d1a48eb 100644
--- a/src/hooks/useLine.js
+++ b/src/hooks/useLine.js
@@ -159,5 +159,6 @@ export const useLine = () => {
     addPitchText,
     removePitchText,
     addPitchTextsByOuterLines,
+    getLengthByLine,
   }
 }
diff --git a/src/hooks/usePolygon.js b/src/hooks/usePolygon.js
index 39e82210..558bec36 100644
--- a/src/hooks/usePolygon.js
+++ b/src/hooks/usePolygon.js
@@ -15,6 +15,7 @@ import { flowDisplaySelector } from '@/store/settingAtom'
 import { fontSelector } from '@/store/fontAtom'
 import { QLine } from '@/components/fabric/QLine'
 import { LINE_TYPE, POLYGON_TYPE } from '@/common/common'
+import { useLine } from '@/hooks/useLine'
 
 export const usePolygon = () => {
   const canvas = useRecoilValue(canvasState)
@@ -24,6 +25,8 @@ export const usePolygon = () => {
   const currentAngleType = useRecoilValue(currentAngleTypeSelector)
   const pitchText = useRecoilValue(pitchTextSelector)
 
+  const { getLengthByLine } = useLine()
+
   const addPolygon = (points, options, isAddCanvas = true) => {
     const polygon = new QPolygon(points, {
       ...options,
@@ -1104,7 +1107,7 @@ export const usePolygon = () => {
         if (!representLine) {
           representLine = line
         } else {
-          if (representLine.length < line.length) {
+          if (getLengthByLine(representLine) < getLengthByLine(line)) {
             representLine = line
           }
         }