diff --git a/src/Add-on/DrawDrilling/DrawDrillingTool.ts b/src/Add-on/DrawDrilling/DrawDrillingTool.ts
index b9caad41a..adefa6847 100644
--- a/src/Add-on/DrawDrilling/DrawDrillingTool.ts
+++ b/src/Add-on/DrawDrilling/DrawDrillingTool.ts
@@ -269,7 +269,7 @@ export class DrawDrillingTool extends Singleton
     private CheckDrillInBoard(br: Board, en: GangDrill, dist: number)
     {
         let cu = br.ContourCurve;
-        let p = en.Position.setX(dist).applyMatrix4(this.m_Face.OCS).applyMatrix4(br.OCSInv);
+        let p = en.Position.setX(dist).applyMatrix4(this.m_Face.OCS).applyMatrix4(br.OCSInv).setZ(0);
         return IsPointInPolyLine(cu as Polyline, p);
     }
     // 分析当前排钻