diff --git a/src/components/fabric/QLine.js b/src/components/fabric/QLine.js
index 02448cd7..d1e1ada3 100644
--- a/src/components/fabric/QLine.js
+++ b/src/components/fabric/QLine.js
@@ -72,13 +72,17 @@ export const QLine = fabric.util.createClass(fabric.Line, {
 
   setLength() {
     // Ensure all required properties are valid numbers
-    const { x1, y1, x2, y2 } = this;
+    const { x1, y1, x2, y2 } = this
     if (isNaN(x1) || isNaN(y1) || isNaN(x2) || isNaN(y2)) {
-      logger.error('Invalid coordinates in QLine:', { x1, y1, x2, y2 });
-      this.length = 0;
-      return;
+      logger.error('Invalid coordinates in QLine:', { x1, y1, x2, y2 })
+      this.length = 0
+      return
     }
-    this.length = calcLinePlaneSize({ x1, y1, x2, y2 }) / 10;
+    this.length = calcLinePlaneSize({ x1, y1, x2, y2 }) / 10
+  },
+
+  setLengthByValue(length) {
+    this.length = length / 10
   },
 
   addLengthText() {
diff --git a/src/hooks/useLine.js b/src/hooks/useLine.js
index 66dff769..c9de0194 100644
--- a/src/hooks/useLine.js
+++ b/src/hooks/useLine.js
@@ -10,7 +10,7 @@ import {
 } from '@/store/canvasAtom'
 import { QLine } from '@/components/fabric/QLine'
 import { basicSettingState } from '@/store/settingAtom'
-import { calcLineActualSize } from '@/util/qpolygon-utils'
+import { calcLineActualSizeByLineLength } from '@/util/qpolygon-utils'
 import { getDegreeByChon } from '@/util/canvas-util'
 import { useText } from '@/hooks/useText'
 import { fontSelector } from '@/store/fontAtom'
@@ -181,7 +181,7 @@ export const useLine = () => {
         if (isVertical) {
           line.attributes = {
             ...line.attributes,
-            actualSize: calcLineActualSize(line, getDegreeByChon(pitch)),
+            actualSize: calcLineActualSizeByLineLength(lineLength, getDegreeByChon(pitch)),
           }
         } else if (isDiagonal) {
           const yLength = Math.abs(y2 - y1) * 10
@@ -195,7 +195,7 @@ export const useLine = () => {
         if (isHorizontal) {
           line.attributes = {
             ...line.attributes,
-            actualSize: calcLineActualSize(line, getDegreeByChon(pitch)),
+            actualSize: calcLineActualSizeByLineLength(lineLength, getDegreeByChon(pitch)),
           }
         } else if (isDiagonal) {
           const xLength = Math.abs(x2 - x1) * 10
diff --git a/src/hooks/usePolygon.js b/src/hooks/usePolygon.js
index 011b8852..8822fd5f 100644
--- a/src/hooks/usePolygon.js
+++ b/src/hooks/usePolygon.js
@@ -1,7 +1,19 @@
-import { ANGLE_TYPE, canvasState, currentAngleTypeSelector, globalPitchState, pitchTextSelector } from '@/store/canvasAtom'
+import {
+  ANGLE_TYPE,
+  canvasState,
+  currentAngleTypeSelector,
+  globalPitchState,
+  pitchTextSelector,
+} from '@/store/canvasAtom'
 import { useRecoilValue } from 'recoil'
 import { fabric } from 'fabric'
-import { calculateIntersection, findAndRemoveClosestPoint, getDegreeByChon, getDegreeInOrientation, isPointOnLine } from '@/util/canvas-util'
+import {
+  calculateIntersection,
+  findAndRemoveClosestPoint,
+  getDegreeByChon,
+  getDegreeInOrientation,
+  isPointOnLine,
+} from '@/util/canvas-util'
 import { QPolygon } from '@/components/fabric/QPolygon'
 import { isSamePoint, removeDuplicatePolygons } from '@/util/qpolygon-utils'
 import { basicSettingState, flowDisplaySelector } from '@/store/settingAtom'
@@ -1958,6 +1970,38 @@ export const usePolygon = () => {
     canvas.renderAll()
   }
 
+  /**
+   * 폴리곤의 라인 길이가 10 이하로 차이나는 경우 작은 값으로 통일
+   * @param polygon
+   */
+  const unifyLineLengths = (polygon) => {
+    if (!polygon.lines || polygon.lines.length === 0) {
+      return
+    }
+
+    const lines = polygon.lines
+
+    for (let i = 0; i < lines.length; i++) {
+      for (let j = i + 1; j < lines.length; j++) {
+        const length1 = lines[i].getLength()
+        const length2 = lines[j].getLength()
+        const diff = Math.abs(length1 - length2)
+
+        if (diff > 0 && diff <= 10) {
+          const minLength = Math.min(length1, length2)
+          if (length1 > length2) {
+            lines[i].setLengthByValue(minLength)
+          } else {
+            lines[j].setLengthByValue(minLength)
+          }
+        }
+      }
+    }
+
+    addLengthText(polygon)
+    canvas.renderAll()
+  }
+
   /**
    * 폴리곤의 라인 속성을 복도치수, 실제치수에 따라 actualSize 설정
    * @param polygon
@@ -1966,7 +2010,7 @@ export const usePolygon = () => {
     if (!polygon.lines || polygon.lines.length === 0 || !polygon.roofMaterial) {
       return
     }
-
+    unifyLineLengths(polygon)
     polygon.lines.forEach((line) => {
       setActualSize(line, polygon.direction, +polygon.roofMaterial?.pitch)
     })
@@ -1983,5 +2027,6 @@ export const usePolygon = () => {
     splitPolygonWithLines,
     splitPolygonWithSeparate,
     setPolygonLinesActualSize,
+    unifyLineLengths,
   }
 }
diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index abcd66ce..e1ff8575 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -5992,6 +5992,17 @@ export const calcLineActualSize = (points, degree = 0) => {
   return Big(planeSize).div(theta).round().toNumber()
 }
 
+/**
+ * 포인트와 기울기를 기준으로 선의 길이를 구한다.
+ * @param lineLength
+ * @param degree
+ * @returns number
+ */
+export const calcLineActualSizeByLineLength = (lineLength, degree = 0) => {
+  const theta = Big(Math.cos(Big(degree).times(Math.PI).div(180)))
+  return Big(lineLength).div(theta).round().toNumber()
+}
+
 export const createLinesFromPolygon = (points) => {
   const lines = []
   for (let i = 0; i < points.length; i++) {