diff --git a/__test__/Room/RoomParse.test.ts b/__test__/Room/RoomParse.test.ts
index 1e58b99ce..1ae78d71c 100644
--- a/__test__/Room/RoomParse.test.ts
+++ b/__test__/Room/RoomParse.test.ts
@@ -291,3 +291,13 @@ test('当墙线无法连接时,如何正确的构造补盖子', () =>
 
     TestWallCurveParse(walls);
 });
+
+test('精度导致0.02线丢失导致区域丢失', () =>
+{
+    let d =
+        { "file": [7, "RoomWallLine", 1, 3, 8, 2, 113, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 36684.65714498695, 6147.320275722739, 0, 36684.65714498695, -51.88108393827861, 0, "RoomWallLine", 1, 3, 8, 2, 118, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 42738.506121433034, 6087.320275722739, 0, 36625.65714498695, 6087.320275722739, 0, "RoomWallLine", 1, 3, 8, 2, 117, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 42738.506121433034, 3309.5257186513045, 0, 42738.506121433034, 6087.320275722739, 0, "RoomWallLine", 1, 3, 8, 2, 122, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 36684.65714498695, 43.94864216606105, 0, 42738.506121433034, 3309.5257186513045, 0, "RoomWallLine", 1, 3, 8, 2, 116, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 47479.48970448707, 3309.5257186513045, 0, 42738.506121433034, 3309.5257186513045, 0, "RoomWallLine", 1, 3, 8, 2, 115, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 47479.48970448707, -51.88108393827906, 0, 47479.48970448707, 3309.5257186513045, 0, "RoomWallLine", 1, 3, 8, 2, 114, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 120, 0, 2700, 36684.65714498695, -51.88108393827861, 0, 47479.48970448707, -51.88108393827906, 0], "basePt": { "x": 36624.65714498695, "y": -111.88108393827906, "z": 0 }, "ucs": [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1] };
+
+    let walls = LoadEntityFromFileData<RoomWallLine>(d);
+
+    TestWallCurveParse(walls);
+});
diff --git a/__test__/Room/__snapshots__/RoomParse.test.ts.snap b/__test__/Room/__snapshots__/RoomParse.test.ts.snap
index 8d03f3ec4..53a4351f0 100644
--- a/__test__/Room/__snapshots__/RoomParse.test.ts.snap
+++ b/__test__/Room/__snapshots__/RoomParse.test.ts.snap
@@ -1821,3 +1821,131 @@ Array [
   0,
 ]
 `;
+
+exports[`精度导致0.02线丢失导致区域丢失 1`] = `
+Array [
+  0,
+  -5882.833669024325,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 2`] = `
+Array [
+  0,
+  -0.022357049821039254,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 3`] = `
+Array [
+  0,
+  -6259.201359661018,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 4`] = `
+Array [
+  -1,
+  0,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 5`] = `
+Array [
+  -5933.848976446083,
+  0,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 6`] = `
+Array [
+  -6172.848976446083,
+  0,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 7`] = `
+Array [
+  0,
+  2681.9871880169153,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 8`] = `
+Array [
+  0,
+  2777.7945570714346,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 9`] = `
+Array [
+  5933.848976446083,
+  3200.846481007409,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 10`] = `
+Array [
+  6008.999771954339,
+  3241.3844455397625,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 11`] = `
+Array [
+  -4665.832787545776,
+  0,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 12`] = `
+Array [
+  -4740.983583054032,
+  0,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 13`] = `
+Array [
+  0,
+  3241.4068025895835,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 14`] = `
+Array [
+  0,
+  3481.4068025895835,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 15`] = `
+Array [
+  10674.832559500115,
+  -4.547473508864641e-13,
+  0,
+]
+`;
+
+exports[`精度导致0.02线丢失导致区域丢失 16`] = `
+Array [
+  10914.832559500115,
+  -4.547473508864641e-13,
+  0,
+]
+`;
diff --git a/src/Add-on/ExportData.tsx b/src/Add-on/ExportData.tsx
index a65d984fa..332ca3d15 100644
--- a/src/Add-on/ExportData.tsx
+++ b/src/Add-on/ExportData.tsx
@@ -38,10 +38,12 @@ import { PhysicalMaterialRecord } from "../DatabaseServices/PhysicalMaterialReco
 import { RoomFlatBase } from '../DatabaseServices/Room/Entity/Flat/RoomFlatBase';
 import { RoomHolePolyline } from '../DatabaseServices/Room/Entity/Wall/Hole/RoomHolePolyline';
 import { RoomWallBase } from '../DatabaseServices/Room/Entity/Wall/RoomWallBase';
+import { RoomWallParse } from '../DatabaseServices/Room/ParseService/RoomWallParse';
 import { Shape } from "../DatabaseServices/Shape";
 import { TextureTableRecord } from "../DatabaseServices/Texture";
 import { Command } from "../Editor/CommandMachine";
 import { PromptSsgetResult, PromptStatus } from "../Editor/PromptResult";
+import { IdentityMtx4 } from '../Geometry/GeUtils';
 import { Orbit } from '../Geometry/Orbit';
 import { RenderType } from '../GraphicsSystem/RenderType';
 import { arrayPushArray } from '../Nest/Common/ArrayExt';
@@ -149,6 +151,8 @@ export class Command_ExportData implements Command
         let ents = ssRes.SelectSet.SelectEntityList;
         ents.push(app.Database.SunLight, app.Database.HemisphereLight);//保证传递灯光参数
         let d = Entitys2Data(ents);
+        if (ents.some(e => e instanceof RoomWallBase))
+            d.Entitys.push(ConverRoomRoof2Data());
         d.Clear = isClear;
         AppendUserInfo(d);
         let dstr = JSON.stringify(d);
@@ -740,6 +744,23 @@ function ConverRoomFlat2Data(roomEnt: RoomFlatBase)
     return ed;
 }
 
+function ConverRoomRoof2Data()
+{
+    let ed: any = {};
+    ed.Id = 69;
+    ed.Type = "RoomRoof";
+    ed.OCS = IdentityMtx4.elements;
+    ed.MaterialId = 71;
+
+    let f = new CADFiler;
+    f.Write(RoomWallParse._CacheRoofs.length);
+    for (let c of RoomWallParse._CacheRoofs)
+        f.WriteObject(c);
+
+    ed.Data = f.Data;
+    return ed;
+}
+
 //OBJ文件
 const objExport = new OBJExporter;
 function GetOBJFileData(en: Entity): string
diff --git a/src/DatabaseServices/Room/ParseService/CurveTrim.ts b/src/DatabaseServices/Room/ParseService/CurveTrim.ts
index 9818b5cb5..37b3ac307 100644
--- a/src/DatabaseServices/Room/ParseService/CurveTrim.ts
+++ b/src/DatabaseServices/Room/ParseService/CurveTrim.ts
@@ -26,10 +26,10 @@ export class CurveTrim
         if (this._IsErase) return;
 
         //交点参数列表
-        let iParams = this._curve.IntersectWith2(contour.Curve, IntersectOption.ExtendNone).map(p => p.thisParam).filter(p => p > 1e-4 && p < 0.9999);
+        let iParams = this._curve.IntersectWith2(contour.Curve, IntersectOption.ExtendNone).map(p => p.thisParam).filter(p => p > 1e-6 && p < 0.999999);
         iParams.push(0, 1);
         iParams.sort((a, b) => a - b);
-        arrayRemoveDuplicateBySort(iParams, (a1, a2) => equaln(a1, a2, 1e-4));
+        arrayRemoveDuplicateBySort(iParams, (a1, a2) => equaln(a1, a2, 1e-6));
 
         if (iParams.length === 2)//[0,1]全包含 或者在外部
         {
diff --git a/src/DatabaseServices/Room/ParseService/RoomRegionParse.ts b/src/DatabaseServices/Room/ParseService/RoomRegionParse.ts
index 30560ded4..dde0ddcb1 100644
--- a/src/DatabaseServices/Room/ParseService/RoomRegionParse.ts
+++ b/src/DatabaseServices/Room/ParseService/RoomRegionParse.ts
@@ -80,7 +80,10 @@ export class RoomRegionParse
                 curves.push(c);
         }
 
-        let parse = new RegionParse(curves);
+        const REGION_PARSE_NUM = 3;
+        const POLYLINE_JOIN_FUZZ = Math.pow(10, -REGION_PARSE_NUM);
+
+        let parse = new RegionParse(curves, REGION_PARSE_NUM);
 
         for (let [orgArc, arcs] of parse.ExpLineMap)
         {
@@ -95,7 +98,7 @@ export class RoomRegionParse
         //分析内外墙1内2外
         for (let routes of parse.RegionsOutline)
         {
-            let pl = Polyline.Combine(routes.map(r => r.curve), 1e-3);
+            let pl = Polyline.Combine(routes.map(r => r.curve), POLYLINE_JOIN_FUZZ);
 
             // for (let i = 0; i < routes.length; i++)
             // {
@@ -125,6 +128,8 @@ export class RoomRegionParse
         let cons = regionPolylines.map(pl => new ContourTreeNode(Contour.CreateContour(pl, false)));
         ContourTreeNode.ParseContourTree(cons);
 
+        let roofs: Polyline[] = [];
+
         //解析 天花板区域 内空区域
         for (let con of cons)
         {
@@ -138,7 +143,9 @@ export class RoomRegionParse
                     for (let r of routes)
                         r.curve[CURVE_FACE_TYPE_KEY] = WallFaceType.Outside;
 
-                //未来我们需要返回这个轮廓,以便在ue中可以绘制真正的屋顶
+                //我们需要返回这个轮廓,以便在ue中可以绘制真正的屋顶
+                con.contour.Curve.Z = maxZ;
+                roofs.push(con.contour.Curve as Polyline);
             }
             else if (con.contour.Curve.ColorIndex === 1)//内空区域
             {
@@ -229,6 +236,8 @@ export class RoomRegionParse
             // wall.RightCurves && arrayRemoveDuplicateBySort(wall.RightCurves, (cu1: Curve, cu2: Curve) => cu1.Join(cu2) === Status.True);
             wall.Update();
         }
+
+        return roofs;
     }
 
     End()
diff --git a/src/DatabaseServices/Room/ParseService/RoomWallParse.ts b/src/DatabaseServices/Room/ParseService/RoomWallParse.ts
index 7e10f4635..2a470047b 100644
--- a/src/DatabaseServices/Room/ParseService/RoomWallParse.ts
+++ b/src/DatabaseServices/Room/ParseService/RoomWallParse.ts
@@ -46,6 +46,7 @@ export class RoomWallParse
     static _CacheWallNodePoints: Vector3[] = [];
     static _CacheWallMaps: [RoomWallExtendAndBreak, CurveMap][] = [];
     static _CacheCurveWallMaps: Map<Curve, RoomWallBase> = new Map();
+    static _CacheRoofs: Polyline[] = [];
 
     /**
      * @param [_ExtendsWalls=true] 更新墙体,在开图时不更新图纸
@@ -68,6 +69,7 @@ export class RoomWallParse
             RoomWallParse._CacheWallNodePoints = [];
             RoomWallParse._CacheWallMaps = [];
             RoomWallParse._CacheCurveWallMaps = new Map();
+            RoomWallParse._CacheRoofs = [];
         }
 
         let regionPrase = new RoomRegionParse(this._UpdateDb);
@@ -95,7 +97,10 @@ export class RoomWallParse
         for (let [, walls] of zgroupMap)
         {
             this.PraseWallsFromSameFloor(walls, changeWalls);
-            regionPrase.Do(walls);
+            let roofs = regionPrase.Do(walls);
+
+            if (this._IsCacheWallNodePoints)
+                arrayPushArray(RoomWallParse._CacheRoofs, roofs);
         }
 
         regionPrase.End();