diff --git a/__test__/Booloperate/more_sub.test.ts b/__test__/Booloperate/more_sub.test.ts
new file mode 100644
index 000000000..fe8588f68
--- /dev/null
+++ b/__test__/Booloperate/more_sub.test.ts
@@ -0,0 +1,18 @@
+import { Polyline } from "../../src/api";
+import { Contour } from "../../src/DatabaseServices/Contour";
+import { LoadEntityFromFileData } from "../Utils/LoadEntity.util";
+
+test('多个布尔错误', () =>
+{
+    let d =
+        [2, "Polyline", 8, 2, 0, false, 0, 1, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 142, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 0, 2, 8, [942, -142], 0, [942, 202], 0, [430, 202], 0, [430.0000000000002, 18], 0, [430.0000000000002, 18], 0, [430.0000000000002, 0], 0, [0, 0], 0, [0, -142], 0, true, "Polyline", 8, 2, 0, false, 0, 2, 0, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 142, 0, 1], 0, 0, true, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 142, 0, 1], 0, 2, 4, [0, 0], 0, [698, 0], 0, [698, 18], 0, [0, 18], 0, true];
+
+    let pls = LoadEntityFromFileData(d) as Polyline[];
+
+    let cons = pls.map(pl => Contour.CreateContour(pl));
+
+    let res = cons[0].GetSubtractListByMoreTargets(cons.slice(1));
+
+    expect(res.outlines.length).toBe(1);
+    expect(res.holes.length).toBe(0);
+});
diff --git a/src/DatabaseServices/Contour.ts b/src/DatabaseServices/Contour.ts
index eccebf47a..3b76d0d56 100644
--- a/src/DatabaseServices/Contour.ts
+++ b/src/DatabaseServices/Contour.ts
@@ -603,12 +603,12 @@ function fastEqualCurve(c1: Curve, c2: Curve, tolerance = 1e-3)
 //也许有一天这个中点算法需要改一下, 使用.MidPoint比较稳妥
 function fastCurveInCurve(sourceCu: Polyline | Circle, targetCu: Curve)
 {
-    return sourceCu.PtInCurve(targetCu.GetPointAtParam(targetCu.EndParam * 0.5));
+    return sourceCu.PtInCurve(targetCu.Midpoint);
 }
 
 //当交点小于等于1时
 export function fastCurveInCurve2(sourceCu: Polyline | Circle, targetCu: Curve)
 {
     return sourceCu.PtInCurve(targetCu.StartPoint) ||
-        sourceCu.PtInCurve(targetCu.GetPointAtParam(targetCu.EndParam * 0.5));
+        sourceCu.PtInCurve(targetCu.Midpoint);
 }