diff --git a/Runtime/Coord/Grid/GridCoord.cs b/Runtime/Coord/Grid/GridCoord.cs
index f716f09b..52982881 100644
--- a/Runtime/Coord/Grid/GridCoord.cs
+++ b/Runtime/Coord/Grid/GridCoord.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using UnityEngine;
 using XUGL;
 
@@ -174,5 +175,31 @@ namespace XCharts.Runtime
                 return true;
             return false;
         }
+
+        /// <summary>
+        /// 给定的线段和Grid边界的交点
+        /// </summary>
+        /// <param name="sp"></param>
+        /// <param name="ep"></param>
+        /// <returns></returns>
+        public bool BoundaryPoint(Vector3 sp, Vector3 ep, ref List<Vector3> point)
+        {
+            if (Contains(sp) && Contains(ep))
+                return false;
+            var lb = new Vector3(context.x, context.y);
+            var lt = new Vector3(context.x, context.y + context.height);
+            var rt = new Vector3(context.x + context.width, context.y + context.height);
+            var rb = new Vector3(context.x + context.width, context.y);
+            var flag = false;
+            if (UGLHelper.GetIntersection(sp, ep, lb, lt, ref point))
+                flag = true;
+            if (UGLHelper.GetIntersection(sp, ep, lt, rt, ref point))
+                flag = true;
+            if (UGLHelper.GetIntersection(sp, ep, lb, rb, ref point))
+                flag = true;
+            if (UGLHelper.GetIntersection(sp, ep, rb, rt, ref point))
+                flag = true;
+            return flag;
+        }
     }
 }
\ No newline at end of file
diff --git a/Runtime/Serie/Line/LineHelper.cs b/Runtime/Serie/Line/LineHelper.cs
index 1dc5fa96..dcbe6957 100644
--- a/Runtime/Serie/Line/LineHelper.cs
+++ b/Runtime/Serie/Line/LineHelper.cs
@@ -282,6 +282,7 @@ namespace XCharts.Runtime
             var lastDataIsIgnore = datas[0].isIgnoreBreak;
             var smooth = serie.lineType == LineType.Smooth;
             var firstInGridPointIndex = smooth && serie.clip ? -1 : 1;
+            var interactPoints = new List<Vector3>();
             for (int i = 1; i < dataCount; i++)
             {
                 var cdata = datas[i];
@@ -313,19 +314,26 @@ namespace XCharts.Runtime
                         if (firstInGridPointIndex > 0 && !grid.Contains(np))
                             isClip = true;
                     }
-                    else if (i == 1 || i == dataCount - 1)
+                    else
                     {
                         var isLpInGrid = grid.Contains(lp);
                         var isCpInGrid = grid.Contains(cp);
-                        if (i == 1 && !isLpInGrid)
+                        if (!isLpInGrid || !isCpInGrid)
                         {
-                            grid.BoundaryPoint(lp, cp, ref lp);
-                        }
-                        if (i == dataCount -1 && !isCpInGrid)
-                        {
-                            if (grid.BoundaryPoint(lp, cp, ref cp))
+                            interactPoints.Clear();
+                            if (grid.BoundaryPoint(lp, cp, ref interactPoints))
                             {
-                                np = cp;
+                                if (interactPoints.Count >= 2)
+                                {
+                                    lp = interactPoints[0];
+                                    cp = interactPoints[1];
+                                }
+                                else if (isLpInGrid)
+                                    cp = interactPoints[0];
+                                else
+                                    lp = interactPoints[0];
+                                if (i == dataCount - 1)
+                                    np = cp;
                             }
                         }
                     }
diff --git a/Runtime/XUGL/UGLHelper.cs b/Runtime/XUGL/UGLHelper.cs
index d394d2e0..0ec9158d 100644
--- a/Runtime/XUGL/UGLHelper.cs
+++ b/Runtime/XUGL/UGLHelper.cs
@@ -133,8 +133,8 @@ namespace XUGL
                 cp2 = ep - (nep - sp).normalized * diff;
                 if (limit) cp2.y = ep.y;
             }
-            int segment = (int) (dist / (smoothness <= 0 ? 2f : smoothness));
-            if (segment < 1) segment = (int) (dist / 0.5f);
+            int segment = (int)(dist / (smoothness <= 0 ? 2f : smoothness));
+            if (segment < 1) segment = (int)(dist / 0.5f);
             if (segment < 4) segment = 4;
             GetBezierList2(ref posList, sp, ep, segment, cp1, cp2);
             if (posList.Count < 2)
@@ -154,7 +154,7 @@ namespace XUGL
             Vector3 cp2 = sp + dist / k * dir * (k - 1);
             cp1.x = sp.x;
             cp2.x = ep.x;
-            int segment = (int) (dist / (smoothness <= 0 ? 2f : smoothness));
+            int segment = (int)(dist / (smoothness <= 0 ? 2f : smoothness));
             GetBezierList2(ref posList, sp, ep, segment, cp1, cp2);
             if (posList.Count < 2)
             {
@@ -169,7 +169,7 @@ namespace XUGL
             List<Vector3> list = new List<Vector3>();
             for (int i = 0; i < segment; i++)
             {
-                list.Add(GetBezier(i / (float) segment, sp, cp, ep));
+                list.Add(GetBezier(i / (float)segment, sp, cp, ep));
             }
             list.Add(ep);
             return list;
@@ -185,7 +185,7 @@ namespace XUGL
             }
             for (int i = 0; i < segment; i++)
             {
-                posList.Add((GetBezier2(i / (float) segment, sp, cp, cp2, ep)));
+                posList.Add((GetBezier2(i / (float)segment, sp, cp, cp2, ep)));
             }
             posList.Add(ep);
         }
@@ -273,6 +273,30 @@ namespace XUGL
             return true;
         }
 
+        /// <summary>
+        /// 获得两直线的交点
+        /// </summary>
+        /// <param name="p1">线段1起点</param>
+        /// <param name="p2">线段1终点</param>
+        /// <param name="p3">线段2起点</param>
+        /// <param name="p4">线段2终点</param>
+        /// <param name="intersection">相交点。当不相交时为初始值</param>
+        /// <returns>相交则返回 true, 否则返回 false</returns>
+        public static bool GetIntersection(Vector3 p1, Vector3 p2, Vector3 p3, Vector3 p4, ref List<Vector3> intersection)
+        {
+            var d = (p2.x - p1.x) * (p4.y - p3.y) - (p2.y - p1.y) * (p4.x - p3.x);
+            if (d == 0)
+                return false;
+
+            var u = ((p3.x - p1.x) * (p4.y - p3.y) - (p3.y - p1.y) * (p4.x - p3.x)) / d;
+            var v = ((p3.x - p1.x) * (p2.y - p1.y) - (p3.y - p1.y) * (p2.x - p1.x)) / d;
+            if (u < 0 || u > 1 || v < 0 || v > 1)
+                return false;
+
+            intersection.Add(new Vector3(p1.x + u * (p2.x - p1.x), p1.y + u * (p2.y - p1.y)));
+            return true;
+        }
+
         /// <summary>
         /// 三个点画线段所需要的六个关键点
         /// </summary>