diff --git a/src/routes/todo.tsx b/src/routes/todo.tsx
index cc4531f..69cc967 100644
--- a/src/routes/todo.tsx
+++ b/src/routes/todo.tsx
@@ -1,23 +1,118 @@
-import { useSuspenseQuery } from '@tanstack/react-query'
+import { useMutation, useSuspenseQuery } from '@tanstack/react-query'
 import { createFileRoute } from '@tanstack/react-router'
 import { createServerFn } from '@tanstack/react-start'
+import { eq } from 'drizzle-orm'
+import type { ChangeEvent, FormEvent } from 'react'
+import { useState } from 'react'
+import { z } from 'zod'
 import { db } from '@/db'
+import { todoTable } from '@/db/schema'
 
+// Zod Schemas
+const createTodoSchema = z.object({
+  title: z.string().min(1, '标题不能为空'),
+})
+
+const updateTodoSchema = z.object({
+  id: z.string().uuid(),
+  completed: z.boolean(),
+})
+
+const deleteTodoSchema = z.object({
+  id: z.string().uuid(),
+})
+
+// Server Functions - CRUD 操作
 const getTodos = createServerFn({ method: 'GET' }).handler(async () => {
-  const todos = await db.query.todoTable.findMany()
+  const todos = await db.query.todoTable.findMany({
+    orderBy: (todos, { desc }) => [desc(todos.createdAt)],
+  })
   return todos
 })
 
+const createTodo = createServerFn({ method: 'POST' })
+  .inputValidator(createTodoSchema)
+  .handler(async ({ data }) => {
+    const [newTodo] = await db
+      .insert(todoTable)
+      .values({ title: data.title })
+      .returning()
+    return newTodo
+  })
+
+const updateTodo = createServerFn({ method: 'POST' })
+  .inputValidator(updateTodoSchema)
+  .handler(async ({ data }) => {
+    const [updatedTodo] = await db
+      .update(todoTable)
+      .set({ completed: data.completed })
+      .where(eq(todoTable.id, data.id))
+      .returning()
+    return updatedTodo
+  })
+
+const deleteTodo = createServerFn({ method: 'POST' })
+  .inputValidator(deleteTodoSchema)
+  .handler(async ({ data }) => {
+    await db.delete(todoTable).where(eq(todoTable.id, data.id))
+    return { success: true }
+  })
+
 export const Route = createFileRoute('/todo')({
   component: Todo,
 })
 
 function Todo() {
-  const { data: todos } = useSuspenseQuery({
+  const [newTodoTitle, setNewTodoTitle] = useState('')
+  const { data: todos, refetch } = useSuspenseQuery({
     queryKey: ['todos'],
     queryFn: () => getTodos(),
   })
 
+  // Mutations
+  const createMutation = useMutation({
+    mutationFn: (title: string) => createTodo({ data: { title } }),
+    onSuccess: () => {
+      setNewTodoTitle('')
+      refetch()
+    },
+  })
+
+  const updateMutation = useMutation({
+    mutationFn: ({ id, completed }: { id: string; completed: boolean }) =>
+      updateTodo({ data: { id, completed } }),
+    onSuccess: () => {
+      refetch()
+    },
+  })
+
+  const deleteMutation = useMutation({
+    mutationFn: (id: string) => deleteTodo({ data: { id } }),
+    onSuccess: () => {
+      refetch()
+    },
+  })
+
+  // Handlers
+  const handleCreateTodo = (e: FormEvent<HTMLFormElement>) => {
+    e.preventDefault()
+    if (newTodoTitle.trim()) {
+      createMutation.mutate(newTodoTitle.trim())
+    }
+  }
+
+  const handleInputChange = (e: ChangeEvent<HTMLInputElement>) => {
+    setNewTodoTitle(e.target.value)
+  }
+
+  const handleToggleTodo = (id: string, currentCompleted: boolean) => {
+    updateMutation.mutate({ id, completed: !currentCompleted })
+  }
+
+  const handleDeleteTodo = (id: string) => {
+    deleteMutation.mutate(id)
+  }
+
   const completedCount = todos.filter((todo) => todo.completed).length
   const totalCount = todos.length
 
@@ -34,6 +129,29 @@ function Todo() {
           </p>
         </div>
 
+        {/* Add Todo Form */}
+        <form onSubmit={handleCreateTodo} className="mb-8">
+          <div className="bg-white rounded-lg shadow-sm p-4">
+            <div className="flex gap-3">
+              <input
+                type="text"
+                value={newTodoTitle}
+                onChange={handleInputChange}
+                placeholder="添加新任务..."
+                className="flex-1 px-4 py-2 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-transparent"
+                disabled={createMutation.isPending}
+              />
+              <button
+                type="submit"
+                disabled={createMutation.isPending || !newTodoTitle.trim()}
+                className="px-6 py-2 bg-gradient-to-r from-indigo-500 to-purple-600 text-white rounded-lg font-medium hover:from-indigo-600 hover:to-purple-700 focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:ring-offset-2 disabled:opacity-50 disabled:cursor-not-allowed transition-all"
+              >
+                {createMutation.isPending ? '添加中...' : '添加'}
+              </button>
+            </div>
+          </div>
+        </form>
+
         {/* Progress Bar */}
         <div className="mb-8 bg-white rounded-lg shadow-sm p-4">
           <div className="flex items-center justify-between mb-2">
@@ -92,7 +210,12 @@ function Todo() {
               >
                 <div className="flex items-start gap-4">
                   {/* Checkbox */}
-                  <div className="flex-shrink-0 pt-1">
+                  <button
+                    type="button"
+                    onClick={() => handleToggleTodo(todo.id, todo.completed)}
+                    disabled={updateMutation.isPending}
+                    className="flex-shrink-0 pt-1 focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:ring-offset-2 rounded-full disabled:opacity-50"
+                  >
                     <div
                       className={`w-6 h-6 rounded-full border-2 flex items-center justify-center transition-all ${
                         todo.completed
@@ -117,7 +240,7 @@ function Todo() {
                         </svg>
                       )}
                     </div>
-                  </div>
+                  </button>
 
                   {/* Todo Content */}
                   <div className="flex-1 min-w-0">
@@ -151,8 +274,8 @@ function Todo() {
                     </div>
                   </div>
 
-                  {/* Status Badge */}
-                  <div className="flex-shrink-0">
+                  {/* Status Badge and Delete Button */}
+                  <div className="flex-shrink-0 flex items-center gap-2">
                     <span
                       className={`inline-flex items-center px-3 py-1 rounded-full text-xs font-medium ${
                         todo.completed
@@ -162,6 +285,28 @@ function Todo() {
                     >
                       {todo.completed ? '已完成' : '进行中'}
                     </span>
+                    <button
+                      type="button"
+                      onClick={() => handleDeleteTodo(todo.id)}
+                      disabled={deleteMutation.isPending}
+                      className="p-2 text-gray-400 hover:text-red-600 hover:bg-red-50 rounded-lg transition-colors focus:outline-none focus:ring-2 focus:ring-red-500 focus:ring-offset-2 disabled:opacity-50"
+                      title="删除任务"
+                    >
+                      <svg
+                        className="w-5 h-5"
+                        fill="none"
+                        viewBox="0 0 24 24"
+                        stroke="currentColor"
+                        aria-hidden="true"
+                      >
+                        <path
+                          strokeLinecap="round"
+                          strokeLinejoin="round"
+                          strokeWidth={2}
+                          d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
+                        />
+                      </svg>
+                    </button>
                   </div>
                 </div>
               </div>
diff --git a/tsconfig.json b/tsconfig.json
index dd311f4..2f120d7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     // Environment setup & latest features
-    "lib": ["ESNext"],
+    "lib": ["ESNext", "DOM", "DOM.Iterable"],
     "target": "ESNext",
     "module": "Preserve",
     "moduleDetection": "force",