diff --git a/packages/fineui/src/widget/year/popup.year.js b/packages/fineui/src/widget/year/popup.year.js
index 520e5978e..a05407d2c 100644
--- a/packages/fineui/src/widget/year/popup.year.js
+++ b/packages/fineui/src/widget/year/popup.year.js
@@ -150,6 +150,7 @@ export class DynamicYearPopup extends Widget {
             },
             tab: {
                 type: LinearSegment.xtype,
+                cls: "bi-split-bottom",
                 invisible: !o.supportDynamic,
                 height: this.constants.tabHeight,
                 items: createItems(