diff --git a/src/Geometry/CurveMap.ts b/src/Geometry/CurveMap.ts
index ee01d7474..f526191e5 100644
--- a/src/Geometry/CurveMap.ts
+++ b/src/Geometry/CurveMap.ts
@@ -11,6 +11,10 @@ import { ToFixed } from "../Common/Utils";
  */
 export class CurveMap
 {
+    constructor(public fractionDigits = 4)
+    {
+
+    }
 
     /*
     节点图.
@@ -73,7 +77,7 @@ export class CurveMap
      */
     private GenerateP(v: Vector3): Vector3
     {
-        let str = v.toArray().map(v => ToFixed(v, 4)).join(",");
+        let str = v.toArray().map(v => ToFixed(v, this.fractionDigits)).join(",");
         if (this.m_vecMap.has(str))
             return this.m_vecMap.get(str);
         this.m_vecMap.set(str, v);
diff --git a/src/Geometry/RegionParse.ts b/src/Geometry/RegionParse.ts
index 082f03913..c2c3024cc 100644
--- a/src/Geometry/RegionParse.ts
+++ b/src/Geometry/RegionParse.ts
@@ -46,7 +46,7 @@ export class RegionParse
      * @param {Curve[]} cuList 请不要传递圆和椭圆.
      * @memberof RegionParse
      */
-    constructor(cuList: Curve[])
+    constructor(cuList: Curve[], public fractionDigits?)
     {
         //需要搜索的站
         let needFinds = this.GenerateNodeMap(cuList);
@@ -194,7 +194,7 @@ export class RegionParse
      */
     private GenerateNodeMap(cuList: Curve[]): Set<Stand>
     {
-        let curveMap = new CurveMap();
+        let curveMap = new CurveMap(this.fractionDigits);
 
         //将多段线炸开
         let plcus: Curve[] = [];