diff --git a/src/Geometry/SpaceParse/ClampSpaceParse.ts b/src/Geometry/SpaceParse/ClampSpaceParse.ts
index aca583a45..bd28e1cd6 100644
--- a/src/Geometry/SpaceParse/ClampSpaceParse.ts
+++ b/src/Geometry/SpaceParse/ClampSpaceParse.ts
@@ -68,7 +68,7 @@ export class ClampSpaceParse extends ISpaceParse
         {
             //空间延伸到背板
             let behindBox = spliteBoxs.get(SplitType.Y);
-            if (behindBox && behindBox.min.y > this.m_SpaceBox.max.y)
+            if (behindBox && behindBox.min.y > this.m_SpaceBox.min.y)
                 this.m_SpaceBox.max.setY(behindBox.min.y);
 
             this.m_ParseOK = true;