diff --git a/packages/form/src/table/Table.vue b/packages/form/src/table/Table.vue
index 60ee20cef..c1429fab9 100644
--- a/packages/form/src/table/Table.vue
+++ b/packages/form/src/table/Table.vue
@@ -1,11 +1,6 @@
 <template>
   <teleport to="body" :disabled="!isFullscreen">
-    <div
-      v-bind="$attrs"
-      class="m-fields-table-wrap"
-      :class="{ fixed: isFullscreen }"
-      :style="isFullscreen ? `z-index: ${nextZIndex()}` : ''"
-    >
+    <div v-bind="$attrs" class="m-fields-table-wrap" :class="{ fixed: isFullscreen }" :style="fullscreenZIndexStyle">
       <div class="m-fields-table" :class="{ 'm-fields-table-item-extra': config.itemExtra }">
         <span v-if="config.extra" style="color: rgba(0, 0, 0, 0.45)" v-html="config.extra"></span>
         <TMagicTooltip
@@ -96,7 +91,7 @@
 </template>
 
 <script setup lang="ts">
-import { computed, ref, useTemplateRef } from 'vue';
+import { computed, ref, useTemplateRef, watch } from 'vue';
 import { FullScreen, Grid, Plus } from '@element-plus/icons-vue';
 
 import { TMagicButton, TMagicPagination, TMagicTable, TMagicTooltip, TMagicUpload, useZIndex } from '@tmagic/design';
@@ -137,6 +132,11 @@ const { pageSize, currentPage, paginationData, handleSizeChange, handleCurrentCh
 );
 
 const { nextZIndex } = useZIndex();
+/** 全屏层 z-index：仅在进入全屏时取一次 nextZIndex，避免每次重渲染累加后盖住 append 到 body 的下拉层 */
+const fullscreenZIndex = ref<number | null>(null);
+const fullscreenZIndexStyle = computed(() =>
+  fullscreenZIndex.value != null ? `z-index: ${fullscreenZIndex.value}` : '',
+);
 const updateKey = ref(1);
 
 const { addable, newHandler } = useAdd(props, emit);
@@ -179,6 +179,15 @@ const sortChangeHandler = (sortOptions: SortProp) => {
   sortChange(props.model[modelName], sortOptions);
 };
 
+// 监听全屏状态，仅在进入全屏时取一次 nextZIndex，避免每次重渲染累加后盖住 append 到 body 的下拉层
+watch(isFullscreen, (on) => {
+  if (on) {
+    fullscreenZIndex.value = nextZIndex();
+  } else {
+    fullscreenZIndex.value = null;
+  }
+});
+
 defineExpose({
   toggleRowSelection,
 });