diff --git a/designer-form/src/main/java/com/fr/design/gui/xpane/BorderLineAndImagePane.java b/designer-form/src/main/java/com/fr/design/gui/xpane/BorderLineAndImagePane.java
index 6e8cac0d8..1db2db2e2 100644
--- a/designer-form/src/main/java/com/fr/design/gui/xpane/BorderLineAndImagePane.java
+++ b/designer-form/src/main/java/com/fr/design/gui/xpane/BorderLineAndImagePane.java
@@ -503,6 +503,7 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
         private int ninePointBottom = -1;
 
         private static final int MIN_NINE_POINT = 0;
+        private static final int MIN_GAP_PARALLEL_LINES = 1;
 
         private int imgWidth;
         private int imgHeight;
@@ -773,8 +774,8 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
         private void onNinePointTopChanged(int value) {
             if (value < MIN_NINE_POINT) {
                 value = MIN_NINE_POINT;
-            } else if (value >= imgHeight - ninePointBottom) {
-                value = imgHeight - ninePointBottom - MIN_NINE_POINT;
+            } else if (value >= imgHeight - ninePointBottom - MIN_GAP_PARALLEL_LINES) {
+                value = imgHeight - ninePointBottom - MIN_GAP_PARALLEL_LINES;
             }
             this.ninePointTop = value;
             repaint();
@@ -783,8 +784,8 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
         private void onNinePointBottomChanged(int value) {
             if (value < MIN_NINE_POINT) {
                 value = MIN_NINE_POINT;
-            } else if (value >= imgHeight - ninePointTop) {
-                value = imgHeight - ninePointTop - MIN_NINE_POINT;
+            } else if (value >= imgHeight - ninePointTop - MIN_GAP_PARALLEL_LINES) {
+                value = imgHeight - ninePointTop - MIN_GAP_PARALLEL_LINES;
             }
             this.ninePointBottom = value;
             repaint();
@@ -793,8 +794,8 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
         private void onNinePointLeftChanged(int value) {
             if (value < MIN_NINE_POINT) {
                 value = MIN_NINE_POINT;
-            } else if (value >= imgWidth - ninePointRight) {
-                value = imgWidth - ninePointRight - MIN_NINE_POINT;
+            } else if (value >= imgWidth - ninePointRight - MIN_GAP_PARALLEL_LINES) {
+                value = imgWidth - ninePointRight - MIN_GAP_PARALLEL_LINES;
             }
             this.ninePointLeft = value;
             repaint();
@@ -803,8 +804,8 @@ public class BorderLineAndImagePane extends JPanel implements UIObserver {
         private void onNinePointRightChanged(int value) {
             if (value < MIN_NINE_POINT) {
                 value = MIN_NINE_POINT;
-            } else if (value >= imgWidth - ninePointLeft) {
-                value = imgWidth - ninePointLeft - MIN_NINE_POINT;
+            } else if (value >= imgWidth - ninePointLeft - MIN_GAP_PARALLEL_LINES) {
+                value = imgWidth - ninePointLeft - MIN_GAP_PARALLEL_LINES;
             }
             this.ninePointRight = value;
             repaint();