diff --git a/web/src/components/common/DirectoryPicker.tsx b/web/src/components/common/DirectoryPicker.tsx
index ba61959..3cf9db6 100644
--- a/web/src/components/common/DirectoryPicker.tsx
+++ b/web/src/components/common/DirectoryPicker.tsx
@@ -1,4 +1,5 @@
-import { Button, Input, Modal, Space, Spin, Tree, Typography } from '@arco-design/web-react'
+import { Button, Input, Message, Modal, Space, Spin, Tree, Typography } from '@arco-design/web-react'
+import { IconFolder, IconFile } from '@arco-design/web-react/icon'
 import { useCallback, useState } from 'react'
 import { listNodeDirectory } from '../../services/nodes'
 import type { DirEntry } from '../../types/nodes'
@@ -14,8 +15,10 @@ interface DirectoryPickerProps {
 interface TreeNodeData {
   key: string
   title: string
+  icon?: React.ReactNode
   isLeaf: boolean
   children?: TreeNodeData[]
+  loaded?: boolean
 }
 
 function entriesToTreeNodes(entries: DirEntry[], mode: 'directory' | 'file'): TreeNodeData[] {
@@ -24,8 +27,8 @@ function entriesToTreeNodes(entries: DirEntry[], mode: 'directory' | 'file'): Tr
     .map((entry) => ({
       key: entry.path,
       title: entry.name,
+      icon: entry.isDir ? <IconFolder /> : <IconFile />,
       isLeaf: !entry.isDir,
-      children: entry.isDir ? [] : undefined,
     }))
 }
 
@@ -34,16 +37,15 @@ export function DirectoryPicker({ value, onChange, placeholder, mode = 'director
   const [treeData, setTreeData] = useState<TreeNodeData[]>([])
   const [loading, setLoading] = useState(false)
   const [selectedPath, setSelectedPath] = useState('')
-  const [error, setError] = useState('')
 
   const loadDirectory = useCallback(
-    async (path: string) => {
+    async (path: string): Promise<TreeNodeData[]> => {
       if (nodeId === undefined) return []
       try {
         const entries = await listNodeDirectory(nodeId, path)
         return entriesToTreeNodes(entries, mode)
       } catch {
-        setError('加载目录失败')
+        Message.error(`加载目录失败: ${path}`)
         return []
       }
     },
@@ -53,7 +55,6 @@ export function DirectoryPicker({ value, onChange, placeholder, mode = 'director
   async function handleOpen() {
     setModalVisible(true)
     setSelectedPath(value || '')
-    setError('')
     setLoading(true)
     try {
       const rootNodes = await loadDirectory('/')
@@ -63,21 +64,26 @@ export function DirectoryPicker({ value, onChange, placeholder, mode = 'director
     }
   }
 
-  async function handleLoadMore(node: TreeNodeData) {
-    const children = await loadDirectory(node.key)
+  // ArcoDesign Tree loadMore: node.props.dataRef 指向 treeData 中的原始对象
+  async function handleLoadMore(treeNode: any): Promise<void> {
+    const nodeKey = treeNode.props.dataRef?.key ?? treeNode.props._key
+    if (!nodeKey) return
+
+    const children = await loadDirectory(nodeKey)
+
     setTreeData((prev) => {
-      function updateChildren(nodes: TreeNodeData[]): TreeNodeData[] {
+      function insertChildren(nodes: TreeNodeData[]): TreeNodeData[] {
         return nodes.map((n) => {
-          if (n.key === node.key) {
-            return { ...n, children }
+          if (n.key === nodeKey) {
+            return { ...n, children, loaded: true }
           }
-          if (n.children) {
-            return { ...n, children: updateChildren(n.children) }
+          if (n.children && n.children.length > 0) {
+            return { ...n, children: insertChildren(n.children) }
           }
           return n
         })
       }
-      return updateChildren(prev)
+      return insertChildren(prev)
     })
   }
 
@@ -88,6 +94,7 @@ export function DirectoryPicker({ value, onChange, placeholder, mode = 'director
     setModalVisible(false)
   }
 
+  // 没有 nodeId 时退化为普通输入框
   if (nodeId === undefined) {
     return <Input value={value} placeholder={placeholder} onChange={onChange} />
   }
@@ -108,30 +115,37 @@ export function DirectoryPicker({ value, onChange, placeholder, mode = 'director
         onOk={handleConfirm}
         okText="选择"
         cancelText="取消"
-        style={{ width: 520 }}
+        style={{ width: 560 }}
         okButtonProps={{ disabled: !selectedPath }}
+        unmountOnExit
       >
-        {error && <Typography.Text type="error">{error}</Typography.Text>}
         {selectedPath && (
-          <Typography.Text type="secondary" style={{ display: 'block', marginBottom: 8 }}>
-            已选择: {selectedPath}
-          </Typography.Text>
+          <div style={{ padding: '8px 12px', marginBottom: 12, background: 'var(--color-fill-2)', borderRadius: 4 }}>
+            <Typography.Text copyable style={{ fontSize: 13 }}>
+              {selectedPath}
+            </Typography.Text>
+          </div>
         )}
         {loading ? (
-          <Spin style={{ display: 'block', textAlign: 'center', padding: 24 }} />
+          <Spin style={{ display: 'block', textAlign: 'center', padding: 40 }} />
         ) : treeData.length === 0 ? (
-          <Typography.Text type="secondary">目录为空</Typography.Text>
+          <Typography.Text type="secondary" style={{ display: 'block', textAlign: 'center', padding: 40 }}>
+            目录为空
+          </Typography.Text>
         ) : (
-          <div style={{ maxHeight: 400, overflow: 'auto' }}>
+          <div style={{ maxHeight: 420, overflow: 'auto', border: '1px solid var(--color-border)', borderRadius: 4, padding: '4px 0' }}>
             <Tree
+              blockNode
+              showLine
               treeData={treeData as any}
+              selectedKeys={selectedPath ? [selectedPath] : []}
               onSelect={(keys) => {
                 if (keys.length > 0) {
                   setSelectedPath(keys[0] as string)
                 }
               }}
-              selectedKeys={selectedPath ? [selectedPath] : []}
-              loadMore={(node: any) => handleLoadMore(node.props)}
+              loadMore={handleLoadMore}
+              icons={{ switcherIcon: <IconFolder style={{ fontSize: 14 }} /> }}
             />
           </div>
         )}