diff --git a/__test__/Polyline/__snapshots__/polylineArea.test.ts.snap b/__test__/Polyline/__snapshots__/polylineArea.test.ts.snap
new file mode 100644
index 000000000..c196660b7
--- /dev/null
+++ b/__test__/Polyline/__snapshots__/polylineArea.test.ts.snap
@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`多段线面积 1`] = `"0.00000"`;
+
+exports[`多段线面积 2`] = `"105946.37829"`;
+
+exports[`多段线面积 3`] = `"183539.66828"`;
+
+exports[`多段线面积 4`] = `"11783.91238"`;
+
+exports[`多段线面积 5`] = `"0.00000"`;
+
+exports[`多段线面积 6`] = `"117468.55553"`;
diff --git a/__test__/Polyline/polylineArea.test.ts b/__test__/Polyline/polylineArea.test.ts
new file mode 100644
index 000000000..605666842
--- /dev/null
+++ b/__test__/Polyline/polylineArea.test.ts
@@ -0,0 +1,16 @@
+import { LoadEntityFromFileData } from "../Utils/LoadEntity.util";
+import { Polyline } from "../../src/DatabaseServices/Entity/Polyline";
+import "../Utils/jest.util";
+
+test('多段线面积', () =>
+{
+    let d =
+        { "file": [6, "Polyline", 5, 2, 101, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 2, [9.569377990430496, 149.52153110047848], 0, [441.3875598086124, 373.2057416267944], 0, false, "Polyline", 5, 2, 102, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 3, [612.4401913875597, 147.12918660287082], 0, [1139.952153110048, 383.9712918660287], 0, [1203.349282296651, 160.28708133971296], 0, false, "Polyline", 5, 2, 103, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 3, [1493.5406698564593, 8.612440191387606], 0, [2302.3923444976076, 372.0095693779905], 0, [2302.3923444976076, -81.81818181818187], 0, true, "Polyline", 5, 2, 104, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 3, [2601.818181818182, 136.88995215311004], 0, [3033.2057416267944, 495.59808612440185], -1.4100385033366523, [3122.2966507177034, 256.4593301435407], 0, false, "Polyline", 5, 2, 105, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 2, [3438.803827751196, -13.157894736842092], -0.37911328762272817, [3745.933014354067, -285.11961722488024], 0, false, "Polyline", 5, 2, 106, false, 1, 7, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 0, 2, 3, [4261.253588516746, -110.68899521531104], 0, [5012.899521531101, 99.37799043062196], -0.5470946737007636, [4261.253588516747, -110.68899521531102], 0, false], "basePt": { "x": 9.569377990430496, "y": -285.1196172248802, "z": 0 } }
+
+    let pls = LoadEntityFromFileData(d) as Polyline[];
+
+    for (let pl of pls)
+    {
+        expect(pl.Area).toMatchNumberSnapshot();
+    }
+});
diff --git a/src/Add-on/testEntity/DrawShapeManage.ts b/src/Add-on/testEntity/DrawShapeManage.ts
index d2948628f..239092c01 100644
--- a/src/Add-on/testEntity/DrawShapeManage.ts
+++ b/src/Add-on/testEntity/DrawShapeManage.ts
@@ -1,6 +1,7 @@
 import { ShapeManager } from "../../DatabaseServices/ShapeManager";
 import { Region } from "../../DatabaseServices/Entity/Region";
 import { app } from "../../ApplicationServices/Application";
+import { Shape } from "../../DatabaseServices/Shape";
 
 export function DrawShapeManage(sm: ShapeManager)
 {
@@ -11,3 +12,13 @@ export function DrawShapeManage(sm: ShapeManager)
 
     app.Database.ModelSpace.Append(reg1);
 }
+
+export function DrawShape(sp: Shape)
+{
+    let reg1 = new Region();
+    //@ts-ignore
+    reg1.m_ShapeManager = new ShapeManager().AppendShapeList(sp);
+    reg1 = reg1.Clone();
+
+    app.Database.ModelSpace.Append(reg1);
+}
diff --git a/src/DatabaseServices/Entity/Polyline.ts b/src/DatabaseServices/Entity/Polyline.ts
index 05ffb03f7..8d6645cc9 100644
--- a/src/DatabaseServices/Entity/Polyline.ts
+++ b/src/DatabaseServices/Entity/Polyline.ts
@@ -360,7 +360,7 @@ export class Polyline extends Curve
     }
     get Area2()
     {
-        if (this.NumberOfVertices < 3 && this.GetBuilgeAt(0) === 0)
+        if (this.EndParam < 2)
             return 0;
 
         let { pts, buls } = this.PtsBuls;
diff --git a/src/DatabaseServices/ShapeManager.ts b/src/DatabaseServices/ShapeManager.ts
index 7ed35ffb5..2d92976eb 100644
--- a/src/DatabaseServices/ShapeManager.ts
+++ b/src/DatabaseServices/ShapeManager.ts
@@ -22,6 +22,7 @@ export class ShapeManager
     AppendShapeList(shapes: Shape | Shape[])
     {
         Array.isArray(shapes) ? this.m_ShapeList.push(...shapes) : this.m_ShapeList.push(shapes);
+        return this;
     }
     Clear()
     {