diff --git a/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs b/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs
index 442090e..ec068ea 100644
--- a/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Helpers/DrawingHelper.cs
@@ -14,7 +14,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             List<Point> points = new List<Point>();
             points.Add(startPoint);
 
-            Point thisPoint= startPoint;           
+            Point thisPoint = startPoint;
             double thisAngle = angle;
 
             Point nextPoint;
@@ -42,7 +42,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         /// <param name="startPoint">起点</param>
         /// <param name="distance">距离</param>
         /// <returns>终点坐标</returns>
-        public static Point GetEndPointByTrigonometric(Point startPoint, double angle,  double distance)
+        public static Point GetEndPointByTrigonometric(Point startPoint, double angle, double distance)
         {
             //角度转弧度
             var radian = (angle * Math.PI) / 180;
@@ -62,7 +62,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         /// <returns>终点坐标</returns>
         public static Point GetEndPointByDirection(Point startPoint, double direction, double distance)
         {
-            return GetEndPointByTrigonometric(startPoint, direction - 90, distance);
+            return GetEndPointByTrigonometric(startPoint, 90 - direction, distance);
         }
 
         public static double GetAngle(Point startPoint, Point endPoint)
@@ -74,9 +74,18 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         public static double GetDirection(Point startPoint, Point endPoint)
         {
-            var radian = (endPoint.Y - startPoint.Y) / (endPoint.X - startPoint.X);
+
+            var radian = Math.Atan2(endPoint.Y - startPoint.Y, endPoint.X - startPoint.X);
             var angle = radian * 180 / Math.PI;
-            return angle + 90;
+            if (angle >= -90 && angle < 90)
+            {
+                return 90 - angle;
+                
+            }
+            else
+            {
+                return angle - 90;
+            }
         }
 
     }