diff --git a/src/components/TreeView.vue b/src/components/TreeView.vue
index d8b9eac..a01e3d5 100644
--- a/src/components/TreeView.vue
+++ b/src/components/TreeView.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, computed, watch, onMounted } from 'vue'
+import { ref, computed, watch, onMounted, nextTick } from 'vue'
 import {
   Folder,
   FolderOpen,
@@ -624,8 +624,15 @@ watch(mockTreeData, (newData) => {
 }, { deep: true, immediate: true })
 
 const selectedId = ref<string | null>('1')
+const focusedId = ref<string | null>('1')
 const expandedIds = ref<Set<string>>(new Set())
 const dialogExpandedIds = ref<Set<string>>(new Set())
+const treeRootRef = ref<HTMLElement | null>(null)
+const contextMenuRef = ref<HTMLElement | null>(null)
+const addNodeDialogRef = ref<HTMLElement | null>(null)
+const operationDialogRef = ref<HTMLElement | null>(null)
+const liveMessage = ref('')
+const contextMenuTriggerId = ref<string | null>(null)
 
 const contextMenu = ref({
   show: false,
@@ -818,8 +825,17 @@ const handleToggle = (id: string, isDialog = false) => {
   const targetSet = isDialog ? dialogExpandedIds : expandedIds
   if (targetSet.value.has(id)) {
     targetSet.value.delete(id)
+    if (!isDialog && focusedId.value && focusedId.value !== id && isDescendantId(id, focusedId.value)) {
+      setActiveNode(id, true, true)
+    }
+    if (!isDialog) {
+      announce('Node collapsed')
+    }
   } else {
     targetSet.value.add(id)
+    if (!isDialog) {
+      announce('Node expanded')
+    }
   }
 }
 
@@ -830,6 +846,7 @@ const handleDoubleClick = (id: string, node: TreeNode) => {
 }
 
 const handleSelect = (id: string, node: TreeNode) => {
+  focusedId.value = id
   selectedId.value = id
   emit('update:modelValue', id)
   emit('select', node)
@@ -846,11 +863,13 @@ const expandAll = () => {
     })
   }
   expandNode(mockTreeData.value)
+  announce('All nodes expanded')
 }
 
 // 折叠所有节点
 const collapseAll = () => {
   expandedIds.value.clear()
+  announce('All nodes collapsed')
 }
 
 const isExpanded = (id: string, isDialog = false) => {
@@ -858,6 +877,202 @@ const isExpanded = (id: string, isDialog = false) => {
   return targetSet.value.has(id)
 }
 const isSelected = (id: string) => selectedId.value === id
+const getNodeById = (id: string) => findNode(mockTreeData.value, id)
+const getVisibleNodeIndex = (id: string) => flattenedNodes.value.findIndex(item => item.node.id === id)
+const getNodeElement = (id: string): HTMLElement | null => {
+  if (!treeRootRef.value) return null
+  const safeId = id.replace(/"/g, '\\"')
+  return treeRootRef.value.querySelector(`[data-node-id="${safeId}"]`) as HTMLElement | null
+}
+const focusNodeElement = (id: string) => {
+  nextTick(() => {
+    getNodeElement(id)?.focus()
+  })
+}
+const setActiveNode = (id: string, select = true, focus = false) => {
+  const node = getNodeById(id)
+  if (!node) return
+  focusedId.value = id
+  if (select) {
+    handleSelect(id, node)
+  }
+  if (focus) {
+    focusNodeElement(id)
+  }
+}
+const isTabStop = (id: string, index: number) => {
+  if (focusedId.value) return focusedId.value === id
+  return index === 0
+}
+const moveFocusByOffset = (offset: number) => {
+  if (flattenedNodes.value.length === 0) return
+  const currentId = focusedId.value || selectedId.value || flattenedNodes.value[0].node.id
+  const currentIndex = getVisibleNodeIndex(currentId)
+  const fallbackIndex = currentIndex < 0 ? 0 : currentIndex
+  const nextIndex = Math.min(flattenedNodes.value.length - 1, Math.max(0, fallbackIndex + offset))
+  const nextNode = flattenedNodes.value[nextIndex]?.node
+  if (nextNode) {
+    setActiveNode(nextNode.id, true, true)
+  }
+}
+const focusFirstVisibleNode = () => {
+  const first = flattenedNodes.value[0]?.node
+  if (first) setActiveNode(first.id, true, true)
+}
+const focusLastVisibleNode = () => {
+  const last = flattenedNodes.value[flattenedNodes.value.length - 1]?.node
+  if (last) setActiveNode(last.id, true, true)
+}
+const isDescendantId = (ancestorId: string, nodeId: string) => {
+  if (ancestorId === nodeId) return true
+  let currentParent = findParentNode(mockTreeData.value, nodeId)
+  while (currentParent) {
+    if (currentParent.id === ancestorId) return true
+    currentParent = findParentNode(mockTreeData.value, currentParent.id)
+  }
+  return false
+}
+const announce = (message: string) => {
+  liveMessage.value = ''
+  nextTick(() => {
+    liveMessage.value = message
+  })
+}
+const openContextMenuFromKeyboard = (nodeId: string) => {
+  const targetEl = getNodeElement(nodeId)
+  const rect = targetEl?.getBoundingClientRect()
+  const x = rect ? Math.min(rect.left + 24, window.innerWidth - 200) : 24
+  const y = rect ? Math.min(rect.bottom, window.innerHeight - 320) : 24
+  contextMenuTriggerId.value = nodeId
+  contextMenu.value = {
+    show: true,
+    x,
+    y,
+    nodeId
+  }
+}
+const focusFirstMenuItem = () => {
+  const item = contextMenuRef.value?.querySelector('.menu-item[tabindex="0"]') as HTMLElement | null
+  item?.focus()
+}
+const focusNodeAfterContextMenu = () => {
+  if (!contextMenuTriggerId.value) return
+  const triggerId = contextMenuTriggerId.value
+  contextMenuTriggerId.value = null
+  focusNodeElement(triggerId)
+}
+const handleMenuKeydown = (event: KeyboardEvent) => {
+  if (!contextMenu.value.show || !contextMenuRef.value) return
+  const items = Array.from(contextMenuRef.value.querySelectorAll('.menu-item[tabindex="0"]')) as HTMLElement[]
+  if (items.length === 0) return
+  const currentIndex = items.findIndex(item => item === document.activeElement)
+  if (event.key === 'ArrowDown') {
+    event.preventDefault()
+    const next = currentIndex < 0 ? 0 : (currentIndex + 1) % items.length
+    items[next].focus()
+    return
+  }
+  if (event.key === 'ArrowUp') {
+    event.preventDefault()
+    const prev = currentIndex < 0 ? items.length - 1 : (currentIndex - 1 + items.length) % items.length
+    items[prev].focus()
+    return
+  }
+  if (event.key === 'Home') {
+    event.preventDefault()
+    items[0].focus()
+    return
+  }
+  if (event.key === 'End') {
+    event.preventDefault()
+    items[items.length - 1].focus()
+    return
+  }
+  if (event.key === 'Escape') {
+    event.preventDefault()
+    closeContextMenu()
+    return
+  }
+  if ((event.key === 'Enter' || event.key === ' ') && document.activeElement instanceof HTMLElement) {
+    event.preventDefault()
+    document.activeElement.click()
+  }
+}
+const handleNodeFocus = (id: string, node: TreeNode) => {
+  focusedId.value = id
+  if (!isSelected(id)) {
+    handleSelect(id, node)
+  }
+}
+const handleTreeKeydown = (event: KeyboardEvent, node: TreeNode, level: number) => {
+  const { key } = event
+  if (key === 'ArrowDown') {
+    event.preventDefault()
+    moveFocusByOffset(1)
+    return
+  }
+  if (key === 'ArrowUp') {
+    event.preventDefault()
+    moveFocusByOffset(-1)
+    return
+  }
+  if (key === 'Home') {
+    event.preventDefault()
+    focusFirstVisibleNode()
+    return
+  }
+  if (key === 'End') {
+    event.preventDefault()
+    focusLastVisibleNode()
+    return
+  }
+  if (key === 'ArrowRight') {
+    event.preventDefault()
+    if (hasChildren(node)) {
+      if (!isExpanded(node.id)) {
+        handleToggle(node.id)
+      } else {
+        const currentIndex = getVisibleNodeIndex(node.id)
+        const nextNode = flattenedNodes.value[currentIndex + 1]
+        if (nextNode && nextNode.level === level + 1) {
+          setActiveNode(nextNode.node.id, true, true)
+        }
+      }
+    }
+    return
+  }
+  if (key === 'ArrowLeft') {
+    event.preventDefault()
+    if (hasChildren(node) && isExpanded(node.id)) {
+      handleToggle(node.id)
+    } else {
+      const parentNode = findParentNode(mockTreeData.value, node.id)
+      if (parentNode) {
+        setActiveNode(parentNode.id, true, true)
+      }
+    }
+    return
+  }
+  if (key === 'Enter') {
+    event.preventDefault()
+    handleSelect(node.id, node)
+    return
+  }
+  if (key === ' ') {
+    event.preventDefault()
+    if (hasChildren(node)) {
+      handleToggle(node.id)
+    } else {
+      handleSelect(node.id, node)
+    }
+    return
+  }
+  if (key === 'ContextMenu' || (key === 'F10' && event.shiftKey)) {
+    event.preventDefault()
+    handleSelect(node.id, node)
+    openContextMenuFromKeyboard(node.id)
+  }
+}
 
 const hasChildren = (node: TreeNode) => node.children && node.children.length > 0
 // 终端节点：只根据显式标记的isTerminal判断
@@ -896,10 +1111,15 @@ const handleContextMenu = (e: MouseEvent, nodeId: string) => {
     y,
     nodeId
   }
+  contextMenuTriggerId.value = nodeId
 }
 
-const closeContextMenu = () => {
+const closeContextMenu = (restoreFocus = true) => {
+  const wasOpen = contextMenu.value.show
   contextMenu.value.show = false
+  if (wasOpen && restoreFocus) {
+    focusNodeAfterContextMenu()
+  }
 }
 
 const openOperationDialog = (mode: 'copy' | 'clone' | 'branch') => {
@@ -914,7 +1134,7 @@ const openOperationDialog = (mode: 'copy' | 'clone' | 'branch') => {
     owner: currentNode?.owner || 'admin'
   }
   dialogExpandedIds.value = new Set(expandedIds.value)
-  closeContextMenu()
+  closeContextMenu(false)
 }
 
 const handleDelete = () => {
@@ -929,8 +1149,15 @@ const handleDelete = () => {
     if (selectedId.value === nodeId) {
       selectedId.value = null
     }
+    const fallbackId = selectedId.value && getNodeById(selectedId.value)
+      ? selectedId.value
+      : flattenedNodes.value[0]?.node.id
+    if (fallbackId) {
+      setActiveNode(fallbackId, true, true)
+    }
+    contextMenuTriggerId.value = null
   }
-  closeContextMenu()
+  closeContextMenu(false)
 }
 
 // 添加同级节点
@@ -959,7 +1186,7 @@ const handleAddSibling = () => {
   }
   console.log('addNodeDialog set to show')
   
-  closeContextMenu()
+  closeContextMenu(false)
 }
 
 // 添加下级节点
@@ -983,7 +1210,7 @@ const handleAddChild = () => {
   }
   console.log('addNodeDialog set to show')
   
-  closeContextMenu()
+  closeContextMenu(false)
 }
 
 // 查找节点在父节点中的索引位置
@@ -1293,6 +1520,49 @@ onMounted(() => {
   initializeReviewHistory()
 })
 
+watch(() => contextMenu.value.show, (show) => {
+  if (show) {
+    nextTick(() => {
+      contextMenuRef.value?.focus()
+      focusFirstMenuItem()
+    })
+  }
+})
+
+watch(() => addNodeDialog.value.show, (show) => {
+  if (show) {
+    nextTick(() => {
+      addNodeDialogRef.value?.focus()
+    })
+  } else if (contextMenuTriggerId.value) {
+    focusNodeAfterContextMenu()
+  }
+})
+
+watch(() => operationDialog.value.show, (show) => {
+  if (show) {
+    nextTick(() => {
+      operationDialogRef.value?.focus()
+    })
+  } else if (contextMenuTriggerId.value) {
+    focusNodeAfterContextMenu()
+  }
+})
+
+watch(flattenedNodes, (nodes) => {
+  if (nodes.length === 0) {
+    focusedId.value = null
+    selectedId.value = null
+    return
+  }
+  if (focusedId.value && !nodes.some(item => item.node.id === focusedId.value)) {
+    focusedId.value = nodes[0].node.id
+  }
+  if (selectedId.value && !nodes.some(item => item.node.id === selectedId.value)) {
+    selectedId.value = focusedId.value || nodes[0].node.id
+  }
+}, { immediate: true })
+
 // 暴露方法给父组件
 defineExpose({
   updateNodeContent
@@ -1309,15 +1579,15 @@ defineExpose({
         <span>Vehicle level - Default(modified)</span>
       </div>
       <div class="tree-header-actions">
-        <button class="tree-header-btn" title="Expand All" @click="expandAll">
+        <button class="tree-header-btn" title="Expand All" aria-label="Expand all nodes" @click="expandAll">
           <Plus :size="12" />
         </button>
-        <button class="tree-header-btn" title="Collapse All" @click="collapseAll">
+        <button class="tree-header-btn" title="Collapse All" aria-label="Collapse all nodes" @click="collapseAll">
           <Minus :size="12" />
         </button>
       </div>
     </div>
-    <div class="tree-content">
+    <div ref="treeRootRef" class="tree-content" role="tree" aria-label="Document tree">
       <div class="tree-column-headers">
         <span class="tree-col-name">Name</span>
         <span class="tree-col-status">Status</span>
@@ -1325,13 +1595,21 @@ defineExpose({
       </div>
       <transition-group name="tree-row" tag="div" class="tree-nodes">
         <div
-          v-for="{ node, level } in flattenedNodes"
+          v-for="({ node, level }, index) in flattenedNodes"
           :key="node.id"
           :class="['tree-node-wrapper', { 'has-children': hasChildren(node) }]"
         >
           <div
             :class="['tree-node', { selected: isSelected(node.id) }]"
+            :data-node-id="node.id"
+            role="treeitem"
+            :aria-level="level + 1"
+            :aria-selected="isSelected(node.id)"
+            :aria-expanded="hasChildren(node) ? isExpanded(node.id) : undefined"
+            :tabindex="isTabStop(node.id, index) ? 0 : -1"
             @click="handleSelect(node.id, node)"
+            @focus="handleNodeFocus(node.id, node)"
+            @keydown="handleTreeKeydown($event, node, level)"
             @dblclick="handleDoubleClick(node.id, node)"
             @contextmenu="handleContextMenu($event, node.id)"
           >
@@ -1339,11 +1617,18 @@ defineExpose({
               class="tree-node-main"
               :style="{ paddingLeft: `${level * 16 + 4}px` }"
             >
-              <span class="tree-node-toggle" @click.stop="handleToggle(node.id)">
+              <button
+                v-if="hasChildren(node)"
+                type="button"
+                class="tree-node-toggle"
+                :aria-label="isExpanded(node.id) ? 'Collapse node' : 'Expand node'"
+                :aria-expanded="isExpanded(node.id)"
+                @click.stop="handleToggle(node.id)"
+              >
                 <Minus v-if="hasChildren(node) && isExpanded(node.id)" :size="12" />
                 <Plus v-else-if="hasChildren(node)" :size="12" />
-                <span v-else class="tree-node-spacer" />
-              </span>
+              </button>
+              <span v-else class="tree-node-spacer" />
               <span class="tree-node-icon">
                 <Link v-if="isMappedNode(node)" :size="14" class="icon-mapped" />
                 <FileText v-else-if="isTerminalNode(node)" :size="14" class="icon-terminal" />
@@ -1384,44 +1669,48 @@ defineExpose({
     </div>
 
     <!-- 右键菜单 -->
-    <div v-if="contextMenu.show" class="context-menu" :style="{ left: contextMenu.x + 'px', top: contextMenu.y + 'px' }"
-      @click.stop>
+    <div v-if="contextMenu.show" ref="contextMenuRef" class="context-menu" :style="{ left: contextMenu.x + 'px', top: contextMenu.y + 'px' }"
+      role="menu" tabindex="-1" @keydown="handleMenuKeydown" @click.stop>
         <div class="menu-group">
-          <div class="menu-item" @click="handleAddSibling">
+          <div class="menu-item" role="menuitem" tabindex="0" @click="handleAddSibling">
             <CornerUpLeft :size="14" />
             <span>添加同级节点</span>
           </div>
-          <div class="menu-item" @click="handleAddChild">
+          <div class="menu-item" role="menuitem" tabindex="0" @click="handleAddChild">
             <CornerDownLeft :size="14" />
             <span>添加下级节点</span>
           </div>
-          <div class="menu-item delete" @click="handleDelete">
+          <div class="menu-item delete" role="menuitem" tabindex="0" @click="handleDelete">
             <Trash2 :size="14" />
             <span>edit</span>
           </div>
-          <div class="menu-item delete" @click="handleDelete">
+          <div class="menu-item delete" role="menuitem" tabindex="0" @click="handleDelete">
             <Trash2 :size="14" />
             <span>Delete</span>
           </div>   
         </div>
         <div class="menu-divider"></div>
         <div class="menu-group">
-          <div class="menu-item" :class="{ disabled: !isCopyEnabled(contextMenuNode) }"
+          <div class="menu-item" :class="{ disabled: !isCopyEnabled(contextMenuNode) }" role="menuitem"
+            :tabindex="isCopyEnabled(contextMenuNode) ? 0 : -1"
             @click="isCopyEnabled(contextMenuNode) && openOperationDialog('copy')">
             <Copy :size="14" />
             <span>添加文档 (Copy From)...</span>
           </div>
-          <div class="menu-item" :class="{ disabled: !isCloneEnabled(contextMenuNode) }"
+          <div class="menu-item" :class="{ disabled: !isCloneEnabled(contextMenuNode) }" role="menuitem"
+            :tabindex="isCloneEnabled(contextMenuNode) ? 0 : -1"
             @click="isCloneEnabled(contextMenuNode) && openOperationDialog('clone')">
             <Database :size="14" />
             <span>添加文档 (Clone From)...</span>
           </div>
-          <div class="menu-item" :class="{ disabled: !isBranchEnabled(contextMenuNode) }"
+          <div class="menu-item" :class="{ disabled: !isBranchEnabled(contextMenuNode) }" role="menuitem"
+            :tabindex="isBranchEnabled(contextMenuNode) ? 0 : -1"
             @click="isBranchEnabled(contextMenuNode) && openOperationDialog('branch')">
             <GitBranch :size="14" />
             <span>Branch From...</span>
           </div>
-          <div class="menu-item" :class="{ disabled: !isMapEnabled(contextMenuNode) }"
+          <div class="menu-item" :class="{ disabled: !isMapEnabled(contextMenuNode) }" role="menuitem"
+            :tabindex="isMapEnabled(contextMenuNode) ? 0 : -1"
             @click="isMapEnabled(contextMenuNode) && handleMapTo()">
             <Plus :size="14" />
             <span>Map To...</span>
@@ -1431,10 +1720,10 @@ defineExpose({
 
     <!-- 添加节点对话框 -->
     <div v-if="addNodeDialog.show" class="dialog-overlay" @click="addNodeDialog.show = false">
-      <div class="add-node-dialog" @click.stop>
+      <div ref="addNodeDialogRef" class="add-node-dialog" role="dialog" aria-modal="true" aria-label="Add node dialog" tabindex="-1" @keydown.esc="addNodeDialog.show = false" @click.stop>
         <div class="dialog-header">
           <h3>{{ addNodeDialog.mode === 'sibling' ? '添加同级节点' : '添加下级节点' }}</h3>
-          <button class="close-btn" @click="addNodeDialog.show = false">
+          <button class="close-btn" aria-label="Close dialog" @click="addNodeDialog.show = false">
             <X :size="18" />
           </button>
         </div>
@@ -1503,11 +1792,11 @@ defineExpose({
 
     <!-- 操作选择弹窗 -->
     <div v-if="operationDialog.show" class="dialog-overlay" @click="operationDialog.show = false">
-      <div class="operation-dialog" @click.stop>
+      <div ref="operationDialogRef" class="operation-dialog" role="dialog" aria-modal="true" aria-label="Operation dialog" tabindex="-1" @keydown.esc="operationDialog.show = false" @click.stop>
         <div class="dialog-header">
           <h3>{{ operationDialog.mode === 'copy' ? 'Copy Node' : operationDialog.mode === 'clone' ? 'Clone Node' :
             'Branch Node' }}</h3>
-          <button class="close-btn" @click="operationDialog.show = false">
+          <button class="close-btn" aria-label="Close dialog" @click="operationDialog.show = false">
             <X :size="18" />
           </button>
         </div>
@@ -1566,6 +1855,7 @@ defineExpose({
         </div>
       </div>
     </div>
+    <div class="sr-only" aria-live="polite" aria-atomic="true">{{ liveMessage }}</div>
   </div>
 </template>
 
@@ -1710,6 +2000,13 @@ defineExpose({
   user-select: none;
   font-size: 12px;
   will-change: background-color, box-shadow, color;
+  outline: none;
+}
+
+.tree-node:focus-visible {
+  box-shadow:
+    0 0 0 2px rgba(0, 120, 212, 0.9),
+    0 0 0 4px rgba(255, 255, 255, 0.85);
 }
 
 .tree-node.selected {
@@ -1750,12 +2047,21 @@ defineExpose({
   margin-right: 2px;
   cursor: pointer;
   color: #666;
+  background: transparent;
+  border: none;
+  padding: 0;
   transition:
     background-color 160ms ease-out,
     color 160ms ease-out,
     transform 220ms ease-out;
 }
 
+.tree-node-toggle:focus-visible {
+  outline: 2px solid #0078d4;
+  outline-offset: 1px;
+  border-radius: 2px;
+}
+
 .tree-node:hover .tree-node-toggle {
   color: #005a9e;
   transform: scale(1.18);
@@ -1992,6 +2298,12 @@ defineExpose({
   transform: translateX(2px);
 }
 
+.menu-item:focus-visible {
+  outline: 2px solid #0078d4;
+  outline-offset: -2px;
+  background: #eef6ff;
+}
+
 .menu-item.disabled {
   opacity: 0.4;
   cursor: not-allowed;
@@ -2404,4 +2716,16 @@ defineExpose({
 .node-owner-input::placeholder {
   color: #999;
 }
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
 </style>