diff --git a/packages/fineui/src/core/utils/dom.js b/packages/fineui/src/core/utils/dom.js
index 216587ec3..fbee6b287 100644
--- a/packages/fineui/src/core/utils/dom.js
+++ b/packages/fineui/src/core/utils/dom.js
@@ -746,7 +746,7 @@ export function getComboPosition(combo, popup, extraWidth, extraHeight, needAdap
         const relativeOffset = positionRelativeElement ? positionRelativeElement.getBoundingClientRect().top : 0;
         if (position.top < comboRect.top) {
             popup.resetHeight(Math.min(viewportBounds.height - position.top - relativeOffset, comboRect.top, maxHeight));
-        } else if (position.top > comboRect.bottom) {
+        } else if (position.top >= comboRect.bottom) {
             popup.resetHeight(Math.min(viewportBounds.height - position.top - relativeOffset, viewportBounds.height - comboRect.bottom, maxHeight));
         }
     }