diff --git a/packages/components/popper/src/content.vue b/packages/components/popper/src/content.vue
index 6fa9517b52..5e8518fc6b 100644
--- a/packages/components/popper/src/content.vue
+++ b/packages/components/popper/src/content.vue
@@ -73,7 +73,7 @@ const createPopperInstance = ({ referenceEl, popperContentEl, arrowEl }) => {
 
 const updatePopper = () => {
   unref(popperInstanceRef)?.update()
-  contentZIndex.value = props.zIndex || nextZIndex()
+  contentZIndex.value = props.zIndex || contentZIndex.value || nextZIndex()
 }
 
 const togglePopperAlive = () => {