diff --git a/src/Add-on/DrawLine.ts b/src/Add-on/DrawLine.ts
index 2bceb1815..8c527246f 100644
--- a/src/Add-on/DrawLine.ts
+++ b/src/Add-on/DrawLine.ts
@@ -10,6 +10,7 @@ import { ObjectSnapMode } from '../Editor/ObjectSnapMode';
 import { PromptStatus } from '../Editor/PromptResult';
 import { SelectPick } from '../Editor/SelectPick';
 import { UCSUtils } from '../Editor/UCSRAII';
+import { userConfig } from '../Editor/UserConfig';
 import { equalv3, ZeroVec } from '../Geometry/GeUtils';
 
 export class DrawLine implements Command
@@ -147,7 +148,7 @@ export class Command_DrawXLine implements Command
             let normal = p2.clone().sub(p1);
             if (equalv3(normal, ZeroVec, 1e-2)) return;
 
-            normal.normalize().multiplyScalar(10000);
+            normal.normalize().multiplyScalar(userConfig.chaidanOption.xlineLength / 2);
             let p3 = p1.clone().add(normal);
             let p4 = p1.clone().sub(normal);
             line.StartPoint = p3;
diff --git a/src/Editor/UserConfig.ts b/src/Editor/UserConfig.ts
index 2dfd52916..e92bad5de 100644
--- a/src/Editor/UserConfig.ts
+++ b/src/Editor/UserConfig.ts
@@ -127,6 +127,7 @@ export class UserConfig implements IConfigStore
         sealValues: '',//封边值列表
         hardwareExpressionFormattingAccuracy: 2,//复合实体表达式值格式化精度
         partialSplitValueCanTakesEffect: false,//板件属性中填写局部拆单值可生效
+        xlineLength: 20000, //构造线长度默认使用20000
     };
     @observable viewSize = {
         minViewHeight: 1e-3,
@@ -241,6 +242,7 @@ export class UserConfig implements IConfigStore
             noModeingData: "",
             hardwareExpressionFormattingAccuracy: 2,
             partialSplitValueCanTakesEffect: false,
+            xlineLength: 20000,
         });
         Object.assign(this.textStyleOption, {
             appointTextHight: false,
@@ -385,7 +387,6 @@ export class UserConfig implements IConfigStore
         if (config.option.version > 8)
         {
             config.option.chaidanOption.modeling2HoleRad = Number(config.option.chaidanOption.modeling2HoleRad);
-            config.option.chaidanOption.hardwareExpressionFormattingAccuracy = 2;
             Object.assign(this.chaidanOption, config.option.chaidanOption);
             this.autoLines = config.option.autoLines;
         }
diff --git a/src/UI/Components/Modal/OptionModal/ChaiDanModal.tsx b/src/UI/Components/Modal/OptionModal/ChaiDanModal.tsx
index ab486937f..23b1905e7 100644
--- a/src/UI/Components/Modal/OptionModal/ChaiDanModal.tsx
+++ b/src/UI/Components/Modal/OptionModal/ChaiDanModal.tsx
@@ -13,6 +13,7 @@ export class ChaiDanPanel extends React.Component
     private chaidanUiData: IUiOption<any>;
     private currentOpt = {
         hardwareExpressionFormattingAccuracy: userConfig.chaidanOption.hardwareExpressionFormattingAccuracy,
+        xlineLength: userConfig.chaidanOption.xlineLength,
     };
     UNSAFE_componentWillMount()
     {
@@ -126,6 +127,24 @@ export class ChaiDanPanel extends React.Component
 
                     /> : <></>}
                 </Label>
+
+                <Label className={Classes.INLINE} >
+                    <span style={{ width: "auto" }}>构造线长度:</span>
+                    <ToasterInput
+                        type={CheckObjectType.GT0Num}
+                        option={userConfig.chaidanOption}
+                        optKey={"xlineLength"}
+                        onChange={(e) => { userConfig.chaidanOption.xlineLength = Number(e.target.value); }}
+                        onBlur={(e, hasErr) =>
+                        {
+                            if (hasErr)
+                                userConfig.chaidanOption.xlineLength = this.currentOpt.xlineLength;
+                            else
+                                this.currentOpt.xlineLength = userConfig.chaidanOption.xlineLength;
+                        }}
+                    />
+                </Label>
+
                 <Label className={Classes.INLINE}>
                     <span style={{ width: "auto" }}>复合实体表达式值格式化精度</span>
                     <ToasterInput
@@ -142,6 +161,7 @@ export class ChaiDanPanel extends React.Component
                         }}
                     />
                 </Label>
+
                 <Checkbox
                     label="板件属性中填写局部拆单值可生效"
                     checked={userConfig.chaidanOption.partialSplitValueCanTakesEffect}