diff --git a/src/PathPlanning/GridMapGenerator.cs b/src/PathPlanning/GridMapGenerator.cs
index 73161e0..30178bb 100644
--- a/src/PathPlanning/GridMapGenerator.cs
+++ b/src/PathPlanning/GridMapGenerator.cs
@@ -1203,7 +1203,7 @@ namespace NavisworksTransport.PathPlanning
                         var scanMax = channelMaxZ + scanHeightInModelUnits;
 
                         // 只有与该网格高度范围重叠的几何体才进入处理
-                        bool isInRange = !(bbox.Max.Z < scanMin || bbox.Min.Z > scanMax);
+                        bool isInRange = !(bbox.Max.Z <= scanMin || bbox.Min.Z > scanMax);
 
                         return isInRange;
                     })