diff --git a/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs b/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs
index 307e23482a422eff9f5fd41626445b25ae4c0efd..16f65d38fc1b76de3b55409d088194cb8deea66b 100644
--- a/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs
+++ b/src/CAD/IFox.CAD.Shared/ExtensionMethod/PointEx.cs
@@ -35,7 +35,7 @@ public static double GetAngle(this Point3d startPoint, Point3d endPoint, Vector3
             _PlaneCache = new Plane(new Point3d(), direction.Value);
         if (_PlaneCache == null)
             _PlaneCache = new Plane(new Point3d(), Vector3d.ZAxis);
-        return startPoint.GetVectorTo(endPoint).AngleOnPlane(_PlaneCache);
+        return endPoint.GetVectorTo(startPoint).AngleOnPlane(_PlaneCache);
     }
     /// <summary>
     /// 两点计算弧度范围0到2Pi
@@ -45,7 +45,7 @@ public static double GetAngle(this Point3d startPoint, Point3d endPoint, Vector3
     /// <returns>弧度值</returns>
     public static double GetAngle(this Point2d startPoint, Point2d endPoint)
     {
-        return startPoint.GetVectorTo(endPoint).Angle;
+        return endPoint.GetVectorTo(startPoint).Angle;
     }
 
     /// <summary>