diff --git a/src/components/TiandituPickMap.vue b/src/components/TiandituPickMap.vue
index 8935db9..38c53fd 100644
--- a/src/components/TiandituPickMap.vue
+++ b/src/components/TiandituPickMap.vue
@@ -1,8 +1,9 @@
 <script setup lang="ts">
-import { onBeforeUnmount, onMounted, ref, watch } from 'vue'
+import { nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { ElMessage } from 'element-plus'
 import {
   getTiandituKey,
+  invalidateMapSize,
   loadTianditu,
   parseTiandituPoiLonlat,
   SUZHOU_MAP_CENTER,
@@ -33,12 +34,46 @@ let map: TiandituMap | null = null
 let marker: TiandituMarker | null = null
 let localSearch: TiandituLocalSearch | null = null
 let tiandituApi: NonNullable<typeof window.T> | null = null
+let resizeTimers: ReturnType<typeof setTimeout>[] = []
 
 function parseCoord(v: string) {
   const n = Number(v)
   return Number.isFinite(n) ? n : null
 }
 
+function clearResizeTimers() {
+  for (const timer of resizeTimers) clearTimeout(timer)
+  resizeTimers = []
+}
+
+function scheduleMapResize() {
+  clearResizeTimers()
+  const delays = [0, 80, 240, 480]
+  for (const delay of delays) {
+    resizeTimers.push(
+      setTimeout(() => {
+        if (map) invalidateMapSize(map)
+      }, delay),
+    )
+  }
+}
+
+function destroyMapInstance() {
+  clearResizeTimers()
+  if (map && marker) {
+    try {
+      map.removeOverLay(marker)
+    } catch {
+      /* ignore */
+    }
+  }
+  marker = null
+  map?.destroy?.()
+  map = null
+  localSearch = null
+  if (containerRef.value) containerRef.value.innerHTML = ''
+}
+
 function applyPick(lng: number, lat: number, zoom = 16) {
   longitude.value = lng.toFixed(6)
   latitude.value = lat.toFixed(6)
@@ -104,6 +139,7 @@ function selectPoi(poi: TiandituSearchPoi) {
 }
 
 async function initMap() {
+  await nextTick()
   if (!containerRef.value) return
 
   mapError.value = ''
@@ -114,14 +150,10 @@ async function initMap() {
 
   mapLoading.value = true
   try {
+    destroyMapInstance()
+
     const T = await loadTianditu()
     tiandituApi = T
-    if (map) {
-      if (marker) map.removeOverLay(marker)
-      marker = null
-      map = null
-    }
-    localSearch = null
 
     const container = containerRef.value
     container.innerHTML = ''
@@ -148,6 +180,8 @@ async function initMap() {
       searchResults.value = []
     })
 
+    scheduleMapResize()
+
     if (props.defaultKeyword.trim()) {
       searchKeyword.value = props.defaultKeyword.trim()
       runSearch()
@@ -156,6 +190,7 @@ async function initMap() {
     mapError.value = e instanceof Error ? e.message : '地图加载失败'
   } finally {
     mapLoading.value = false
+    scheduleMapResize()
   }
 }
 
@@ -168,14 +203,15 @@ watch([longitude, latitude], async () => {
 })
 
 onMounted(() => {
-  void initMap()
+  requestAnimationFrame(() => {
+    requestAnimationFrame(() => {
+      void initMap()
+    })
+  })
 })
 
 onBeforeUnmount(() => {
-  if (map && marker) map.removeOverLay(marker)
-  marker = null
-  map = null
-  localSearch = null
+  destroyMapInstance()
   tiandituApi = null
 })
 </script>
@@ -202,20 +238,22 @@ onBeforeUnmount(() => {
     </ul>
 
     <div v-if="mapError" class="pick-map-error">{{ mapError }}</div>
-    <div
-      v-else
-      ref="containerRef"
-      v-loading="mapLoading"
-      class="pick-map"
-      :style="{ height: `${props.height}px` }"
-    />
+    <div v-else class="pick-map-shell" v-loading="mapLoading">
+      <div
+        ref="containerRef"
+        class="pick-map"
+        :style="{ height: `${props.height}px` }"
+      />
+    </div>
     <p v-if="!mapError" class="pick-hint">可搜索地点或点击地图选点，确定后将填入经纬度</p>
   </div>
 </template>
 
 <style scoped>
 .pick-map-wrap {
+  position: relative;
   margin-top: 4px;
+  overflow: hidden;
 }
 
 .pick-search-bar {
@@ -270,12 +308,27 @@ onBeforeUnmount(() => {
   color: var(--el-text-color-secondary);
 }
 
-.pick-map {
+.pick-map-shell {
+  position: relative;
   width: 100%;
+  overflow: hidden;
   border: 1px solid var(--el-border-color-light);
   border-radius: 6px;
+  background: #e8eef5;
+}
+
+.pick-map {
+  position: relative;
+  z-index: 0;
+  width: 100%;
   overflow: hidden;
   cursor: crosshair;
+  isolation: isolate;
+}
+
+.pick-map :deep(.tdt-map) {
+  width: 100% !important;
+  height: 100% !important;
 }
 
 .pick-map-error {
diff --git a/src/utils/tiandituMap.ts b/src/utils/tiandituMap.ts
index 6e414fd..1fc33ef 100644
--- a/src/utils/tiandituMap.ts
+++ b/src/utils/tiandituMap.ts
@@ -98,6 +98,13 @@ export interface TiandituMap {
   removeEventListener?(type: string, handler: (e?: TiandituMapClickEvent) => void): void
   lngLatToLayerPoint?(lnglat: TiandituLngLat): TiandituPoint
   getPanes?(): { overlayPane: HTMLElement }
+  checkResize?(): void
+  destroy?(): void
+}
+
+/** 弹窗内地图在容器尺寸变化后需重算布局，避免瓦片错位到页面顶部 */
+export function invalidateMapSize(map: TiandituMap) {
+  map.checkResize?.()
 }
 
 interface SchoolMapOverlayInstance {
diff --git a/src/views/assets/universities/index.vue b/src/views/assets/universities/index.vue
index bd3a6c8..8e7a895 100644
--- a/src/views/assets/universities/index.vue
+++ b/src/views/assets/universities/index.vue
@@ -22,6 +22,7 @@ const filterRegion = ref('')
 
 const dialog = ref(false)
 const mapPickVisible = ref(false)
+const mapPickReady = ref(false)
 const editing = ref<UniversityRow | null>(null)
 const pickDraft = ref({ longitude: '', latitude: '' })
 const form = ref({
@@ -90,9 +91,18 @@ function openMapPick() {
     longitude: form.value.longitude,
     latitude: form.value.latitude,
   }
+  mapPickReady.value = false
   mapPickVisible.value = true
 }
 
+function onMapPickOpened() {
+  mapPickReady.value = true
+}
+
+function onMapPickClosed() {
+  mapPickReady.value = false
+}
+
 function confirmMapPick() {
   if (!pickDraft.value.longitude || !pickDraft.value.latitude) {
     ElMessage.warning('请先在地图上选点')
@@ -232,15 +242,20 @@ usePageLoad(load)
 
   <el-dialog
     v-model="mapPickVisible"
+    class="map-pick-dialog"
     title="地图选点"
     width="720px"
     destroy-on-close
     append-to-body
+    align-center
+    @opened="onMapPickOpened"
+    @closed="onMapPickClosed"
   >
     <p v-if="pickDraft.longitude && pickDraft.latitude" class="pick-coord-preview">
       当前选点：{{ pickDraft.longitude }}，{{ pickDraft.latitude }}
     </p>
     <TiandituPickMap
+      v-if="mapPickReady"
       v-model:longitude="pickDraft.longitude"
       v-model:latitude="pickDraft.latitude"
       :default-keyword="form.name"
@@ -276,3 +291,10 @@ usePageLoad(load)
   font-size: 13px;
 }
 </style>
+
+<style>
+/* 弹窗动画 transform 会导致天地图瓦片错位，打开后取消 transform */
+.map-pick-dialog.el-dialog {
+  transform: none !important;
+}
+</style>