diff --git a/designer-chart/src/main/java/com/fr/design/mainframe/chart/gui/style/series/ColorPickerPaneWithMaxMin.java b/designer-chart/src/main/java/com/fr/design/mainframe/chart/gui/style/series/ColorPickerPaneWithMaxMin.java
index 5a0846a18..c6ac36a0c 100644
--- a/designer-chart/src/main/java/com/fr/design/mainframe/chart/gui/style/series/ColorPickerPaneWithMaxMin.java
+++ b/designer-chart/src/main/java/com/fr/design/mainframe/chart/gui/style/series/ColorPickerPaneWithMaxMin.java
@@ -93,9 +93,9 @@ public class ColorPickerPaneWithMaxMin extends ColorPickerPaneWithFormula {
     private void setTextState(TinyFormulaPane tinyFormulaPane, int index, int maxIndex, String value) {
         boolean enable = false;
         if (index == 0) {
-            value = "∞";
+            value = "=∞";
         } else if (index == maxIndex) {
-            value = "-∞";
+            value = "=-∞";
         } else {
             enable = true;
         }