diff --git a/__test__/Room/RoomParse.test.ts b/__test__/Room/RoomParse.test.ts
index 6014e39df..b108a1900 100644
--- a/__test__/Room/RoomParse.test.ts
+++ b/__test__/Room/RoomParse.test.ts
@@ -1,6 +1,6 @@
 import { Curve } from "../../src/DatabaseServices/Entity/Curve";
 import { RoomWallArc } from "../../src/DatabaseServices/Room/Entity/Wall/RoomWallArc";
-import { RoomWallBase } from "../../src/DatabaseServices/Room/Entity/Wall/RoomWallBase";
+import { CURVE_FACE_TYPE_KEY, RoomWallBase } from "../../src/DatabaseServices/Room/Entity/Wall/RoomWallBase";
 import { RoomWallLine } from "../../src/DatabaseServices/Room/Entity/Wall/RoomWallLine";
 import { RoomWallParse } from "../../src/DatabaseServices/Room/ParseService/RoomWallParse";
 import "../Utils/jest.util";
@@ -68,7 +68,7 @@ test('共线墙盖子方向正确性', () =>
     new RoomWallParse(true, undefined, false).Do([walls[0]]);
 });
 
-function TestCurve(c: Curve)
+function TestCurveDerv(c: Curve)
 {
     let derv = c.GetFistDeriv(0);
     expect(derv.toArray()).toMatchSnapshot();
@@ -79,9 +79,9 @@ function TestWallCurveParse(walls: RoomWallBase[])
 
     for (let w of walls)
     {
-        w.LeftCurves.forEach(TestCurve);
-        w.RightCurves.forEach(TestCurve);
-        w.LidCurves.forEach(TestCurve);
+        w.LeftCurves.forEach(TestCurveDerv);
+        w.RightCurves.forEach(TestCurveDerv);
+        w.LidCurves.forEach(TestCurveDerv);
     }
 }
 
@@ -181,3 +181,23 @@ test('圆弧与直线延伸连接错误', () =>
     new RoomWallParse(true, undefined, false).Do(walls);
     TestWallCurveParse(walls);
 });
+
+function TestCurveType(c: Curve)
+{
+    expect(c[CURVE_FACE_TYPE_KEY]).toMatchSnapshot();
+}
+
+test('因为面域分析导致的墙类型不对', () =>
+{
+    let d =
+        { "file": [2, "RoomWallLine", 1, 1, 8, 2, 146, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 25294.194645009495, -1243.0158909486802, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 25294.194645009495, -1243.0158909486802, 0, 1], 0, 120, 4540.8123335336095, 1690.993449999878, 0, 8037.34909787654, 3003.6781037037035, 0, "RoomWallArc", 1, 8, 2, 147, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 33875.59985973879, -98.25468714960243, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 33875.59985973879, -98.25468714960243, 0, 1], 0, 120, 2, 1936.89677036127, 1.8555182812506865, 4.681440295344441, true], "basePt": { "x": 29813.9186811755, "y": -2094.4402340246024, "z": 0 }, "ucs": [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1] };
+
+    let walls = LoadEntityFromFileData<RoomWallBase>(d);
+    new RoomWallParse(true, undefined, false).Do(walls);
+    for (let w of walls)
+    {
+        w.LeftCurves.forEach(TestCurveType);
+        w.RightCurves.forEach(TestCurveType);
+        w.LidCurves.forEach(TestCurveType);
+    }
+});
diff --git a/__test__/Room/__snapshots__/RoomParse.test.ts.snap b/__test__/Room/__snapshots__/RoomParse.test.ts.snap
index 5bbeda4a2..0dbfa1d76 100644
--- a/__test__/Room/__snapshots__/RoomParse.test.ts.snap
+++ b/__test__/Room/__snapshots__/RoomParse.test.ts.snap
@@ -96,6 +96,18 @@ Array [
 ]
 `;
 
+exports[`因为面域分析导致的墙类型不对 1`] = `2`;
+
+exports[`因为面域分析导致的墙类型不对 2`] = `2`;
+
+exports[`因为面域分析导致的墙类型不对 3`] = `2`;
+
+exports[`因为面域分析导致的墙类型不对 4`] = `2`;
+
+exports[`因为面域分析导致的墙类型不对 5`] = `2`;
+
+exports[`因为面域分析导致的墙类型不对 6`] = `2`;
+
 exports[`圆弧与直线延伸连接错误 1`] = `
 Array [
   1176.591242967297,
diff --git a/src/Geometry/RegionParse.ts b/src/Geometry/RegionParse.ts
index def3127c0..459673f78 100644
--- a/src/Geometry/RegionParse.ts
+++ b/src/Geometry/RegionParse.ts
@@ -227,7 +227,7 @@ export class RegionParse
     {
         let underPt = arc.Center.add(new Vector3(0, -arc.Radius));
         let param = arc.GetParamAtPoint(underPt);
-        if (param > 0.01 && param < 0.99)
+        if (param > 1e-4 && param < 0.9999)
             return arc.GetSplitCurves(param);
         else
             return [arc];