diff --git a/__test__/Booloperate/__snapshots__/bool4.test.ts.snap b/__test__/Booloperate/__snapshots__/bool4.test.ts.snap
index 52dfa7e84..5f70019c2 100644
--- a/__test__/Booloperate/__snapshots__/bool4.test.ts.snap
+++ b/__test__/Booloperate/__snapshots__/bool4.test.ts.snap
@@ -11,3 +11,5 @@ exports[`交点大于等于2_但是还是分离 1`] = `310430.5057844047`;
 exports[`交点大于等于2_但是还是分离 2`] = `40090.549687200226`;
 
 exports[`共线多余点 1`] = `618903.9999999995`;
+
+exports[`精度问题,导致的曲线合并失败,导致的无法重新生成轮廓 1`] = `8207.998897234036`;
diff --git a/__test__/Booloperate/bool4.test.ts b/__test__/Booloperate/bool4.test.ts
index c77790ce3..86c5bfe90 100644
--- a/__test__/Booloperate/bool4.test.ts
+++ b/__test__/Booloperate/bool4.test.ts
@@ -1,5 +1,5 @@
-import { LoadRegionsFromFileData } from "../Utils/LoadEntity.util";
 import { BoolOpeartionType } from "../../src/GraphicsSystem/BoolOperateUtils";
+import { LoadRegionsFromFileData } from "../Utils/LoadEntity.util";
 
 test('交点大于等于2_但是还是分离', () =>
 {
@@ -19,7 +19,8 @@ test('交点大于等于2_但是还是分离', () =>
 
 test(`#I118PO`, () =>
 {
-    let d = [2, "Region", 5, 2, 109, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, 1, 1, 1, "Polyline", 5, 2, 0, false, 0, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 4, [0, 0], 0, [349.99999999999983, 0], 0, [349.99999999999983, 18], 0, [0, 18], 0, true, 0, "Region", 5, 2, 110, false, 1, 7, 0, [-0.6481962787933795, -0.7614732983883384, -3.969057490217688e-17, 0, 0.7614732983883384, -0.6481962787933795, 4.66267918753728e-17, 0, 6.123233995736766e-17, 0, -1, 0, -507.79108398045344, 1098.4374795109752, -4.082417520817821e-14, 1], 0, 0, 1, 1, 1, 1, "Polyline", 5, 2, 0, false, 0, 7, 0, [-0.6481962787933795, -0.7614732983883384, -3.969057490217688e-17, 0, -0.7614732983883384, 0.6481962787933795, -4.66267918753728e-17, 0, 6.123233995736766e-17, 0, -1, 0, -507.79108398045344, 1098.4374795109752, -4.082417520817821e-14, 1], 0, 0, 2, 4, [9.993381848422814, -884.0586414166524], 0.17863084838388266, [280.4138219783257, -1365.1880927528969], 0, [507.2825195560087, -1098.6724383169787], -0.09662306706998787, [400.5809327775901, -964.8005274526736], 0, true, 0];
+    let d =
+        [2, "Region", 5, 2, 109, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, 1, 1, 1, "Polyline", 5, 2, 0, false, 0, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 4, [0, 0], 0, [349.99999999999983, 0], 0, [349.99999999999983, 18], 0, [0, 18], 0, true, 0, "Region", 5, 2, 110, false, 1, 7, 0, [-0.6481962787933795, -0.7614732983883384, -3.969057490217688e-17, 0, 0.7614732983883384, -0.6481962787933795, 4.66267918753728e-17, 0, 6.123233995736766e-17, 0, -1, 0, -507.79108398045344, 1098.4374795109752, -4.082417520817821e-14, 1], 0, 0, 1, 1, 1, 1, "Polyline", 5, 2, 0, false, 0, 7, 0, [-0.6481962787933795, -0.7614732983883384, -3.969057490217688e-17, 0, -0.7614732983883384, 0.6481962787933795, -4.66267918753728e-17, 0, 6.123233995736766e-17, 0, -1, 0, -507.79108398045344, 1098.4374795109752, -4.082417520817821e-14, 1], 0, 0, 2, 4, [9.993381848422814, -884.0586414166524], 0.17863084838388266, [280.4138219783257, -1365.1880927528969], 0, [507.2825195560087, -1098.6724383169787], -0.09662306706998787, [400.5809327775901, -964.8005274526736], 0, true, 0];
     let [reg1, reg2] = LoadRegionsFromFileData(d);
 
     let reg = reg1.Clone();
@@ -54,3 +55,12 @@ test('共线多余点', () =>
     reg1.BooleanOper(reg2.Clone(), BoolOpeartionType.Subtract);
     expect(reg1.Area).toMatchSnapshot();
 });
+
+test('精度问题,导致的曲线合并失败,导致的无法重新生成轮廓', () =>
+{
+    let d =
+        { "file": [2, "Region", 10, 2, 110, 0, 1, 7, 71, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, 1, 1, 1, 1, "Polyline", 10, 2, 0, 0, 0, 1, 71, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, 2, 4, [100, 0], 0, [400, 0], 0, [400, 864], 0, [100, 864], 0, true, 0, "Region", 10, 2, 111, 0, 1, 7, 71, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, 1, 1, 1, 1, "Polyline", 10, 2, 0, 0, 0, 2, 71, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -614.9118387909318, -117.20906801007538, 0, 1], 0, 0, 1, 2, 4, [0, 0], 0, [1728.0001196034718, 0], 0, [1728.0001196034718, 9.5], 0, [0, 9.5], 0, true, 0], "basePt": { "x": -0.00023216125555336475, "y": -100, "z": 0 }, "ucs": [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1] };
+    let [reg1, reg2] = LoadRegionsFromFileData(d);
+    reg1.BooleanOper(reg2.Clone(), BoolOpeartionType.Intersection);
+    expect(reg1.Area).toMatchSnapshot();
+});
diff --git a/src/Add-on/Join.ts b/src/Add-on/Join.ts
index 881ac701d..d50899e0e 100644
--- a/src/Add-on/Join.ts
+++ b/src/Add-on/Join.ts
@@ -72,19 +72,22 @@ export class Command_Join implements Command
         }
         else
             remCurves = curveCol;
+
+        const fuzz = 0.01;
         //连接成多段线
-        let groups = curveLinkGroup(remCurves);
+        let groups = curveLinkGroup(remCurves, -Math.log10(fuzz));
         for (let g of groups)
         {
             if (g.length === 1)
                 continue;
 
             let pl = new Polyline();
+            pl.ColorIndex = g[0].ColorIndex;
             pl.OCS = ComputerCurvesNormalOCS(g);
             for (let cu of g)
             {
-                pl.Join(cu);
-                cu.Erase();
+                if (pl.Join(cu, false, fuzz) === Status.True)
+                    cu.Erase();
             }
 
             if (pl.Id === undefined)
diff --git a/src/Add-on/test/testIntersect.ts b/src/Add-on/test/testIntersect.ts
index 41c548b0a..8a9242ef9 100644
--- a/src/Add-on/test/testIntersect.ts
+++ b/src/Add-on/test/testIntersect.ts
@@ -3,10 +3,10 @@ import { app } from "../../ApplicationServices/Application";
 import { Arc } from "../../DatabaseServices/Entity/Arc";
 import { Circle } from "../../DatabaseServices/Entity/Circle";
 import { Curve } from "../../DatabaseServices/Entity/Curve";
+import { Point } from "../../DatabaseServices/Entity/Point";
 import { Command } from "../../Editor/CommandMachine";
 import { PromptStatus } from "../../Editor/PromptResult";
 import { IntersectCircleAndCircle, IntersectOption } from "../../GraphicsSystem/IntersectWith";
-import { Point } from "../../DatabaseServices/Entity/Point";
 
 export class TestIntersect implements Command
 {
diff --git a/src/Add-on/testEntity/test.ts b/src/Add-on/testEntity/test.ts
index 807c97d8d..978749916 100644
--- a/src/Add-on/testEntity/test.ts
+++ b/src/Add-on/testEntity/test.ts
@@ -1,20 +1,25 @@
 import { CADFiler } from "../../DatabaseServices/CADFiler";
-import { Ellipse } from "../../DatabaseServices/Entity/Ellipse";
+import { Region } from "../../DatabaseServices/Entity/Region";
 import { Command } from "../../Editor/CommandMachine";
+import { BoolOpeartionType } from "../../GraphicsSystem/BoolOperateUtils";
 import { HotCMD } from "../../Hot/HotCommand";
+import { TestDraw } from "../test/TestUtil";
 
 @HotCMD
 export class Test implements Command
 {
     async exec()
     {
-        let d = { "file": [2, "Ellipse", 10, 2, 103, 0, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 983.9770911100416, 940.0742538149107, 0, 1], 0, 0, 1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -1926.3535339862863, 877.8288804632223, 0, 1], 0, 0, 1, 1, 418.15520838547974, 225.54490978414745, -0.69713252541264, 6.343188564109003, 7.616407379765725, "Ellipse", 10, 2, 104, 0, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 983.9770911100406, 940.0742538149093, 0, 1], 0, 0, 1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -1926.3535339862863, 877.8288804632223, 0, 1], 0, 0, 1, 1, 418.15520838547974, 225.54490978414745, -0.69713252541264, 3.934994981148553, 6.34318856410901], "basePt": { "x": 655.8960059049625, "y": 620.7541549379562, "z": 0 }, "ucs": [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1] };
+        let d = { "file": [2, "Region", 10, 2, 110, 0, 1, 7, 71, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, 1, 1, 1, 1, "Polyline", 10, 2, 0, 0, 0, 1, 71, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 863.9997678387444, -200, 0, 1], 0, 0, 1, 2, 4, [100, 0], 0, [400, 0], 0, [400, 864], 0, [100, 864], 0, true, 0, "Region", 10, 2, 111, 0, 1, 7, 71, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, 1, 1, 1, 1, "Polyline", 10, 2, 0, 0, 0, 2, 71, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -614.9118387909318, -117.20906801007538, 0, 1], 0, 0, 1, 2, 4, [0, 0], 0, [1728.0001196034718, 0], 0, [1728.0001196034718, 9.5], 0, [0, 9.5], 0, true, 0], "basePt": { "x": -0.00023216125555336475, "y": -100, "z": 0 }, "ucs": [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1] };
         let f = new CADFiler(d.file);
 
         f.Read();
-        let el1 = f.ReadObject() as Ellipse;
-        let el2 = f.ReadObject() as Ellipse;
+        let el1 = f.ReadObject() as Region;
+        let el2 = f.ReadObject() as Region;
 
-        el1.Join(el2);
+        TestDraw(el1.Clone());
+        TestDraw(el2.Clone());
+
+        el1.BooleanOper(el2, BoolOpeartionType.Intersection);
     }
 }
diff --git a/src/Common/CurveUtils.ts b/src/Common/CurveUtils.ts
index 609272968..ac31f627a 100644
--- a/src/Common/CurveUtils.ts
+++ b/src/Common/CurveUtils.ts
@@ -86,7 +86,7 @@ export function getDeterminantFor3V(v1: Vector3, v2: Vector3, v3: Vector3)
  *   [c1,c2,c3...],
  * ]
  */
-export function curveLinkGroup(cus: Curve[]): Array<Array<Curve>>
+export function curveLinkGroup(cus: Curve[], numdimensions = 4): Array<Array<Curve>>
 {
     //返回的曲线组
     let groupCus = new Array<Array<Curve>>();
@@ -100,8 +100,9 @@ export function curveLinkGroup(cus: Curve[]): Array<Array<Curve>>
         return !isClose;
     });
     if (cus.length === 0) return groupCus;
+    const fuzz = 5 * Math.pow(0.1, numdimensions);
     //曲线节点图
-    let cuMap = new CurveMap();
+    let cuMap = new CurveMap(numdimensions);
     cus.forEach(c => cuMap.AddCurveToMap(c));
 
     //曲线站点表
@@ -126,14 +127,14 @@ export function curveLinkGroup(cus: Curve[]): Array<Array<Curve>>
                 if (isEndSeach)
                 {
                     //保证曲线总是从起点连接到终点
-                    if (!equalv3(cu.StartPoint, stand.position))
+                    if (!equalv3(cu.StartPoint, stand.position, fuzz))
                         cu.Reverse();
                     cus.push(cu);
                 }
                 else
                 {
                     //保证曲线总是从起点连接到终点
-                    if (!equalv3(cu.EndPoint, stand.position))
+                    if (!equalv3(cu.EndPoint, stand.position, fuzz))
                         cu.Reverse();
                     cus.unshift(cu);
                 }
diff --git a/src/DatabaseServices/Contour.ts b/src/DatabaseServices/Contour.ts
index 1d8f064d1..bb3c96473 100644
--- a/src/DatabaseServices/Contour.ts
+++ b/src/DatabaseServices/Contour.ts
@@ -523,7 +523,7 @@ export class Contour
         if (Array.isArray(cus[0]))
             cuGroups = cus as Curve[][];
         else
-            cuGroups = curveLinkGroup(cus as Curve[]);
+            cuGroups = curveLinkGroup(cus as Curve[], -Math.log10(COMBINE_FUZZ));
 
         let contours: Contour[] = [];
 
@@ -541,7 +541,7 @@ export class Contour
     {
         if (cus.length === 0) return undefined;
 
-        let groups = needLink ? curveLinkGroup(cus) : [cus];
+        let groups = needLink ? curveLinkGroup(cus, -Math.log10(tolerance)) : [cus];
         for (let g of groups)
         {
             if (g.length === 1)