diff --git a/backend/file.js b/backend/file.js
index 76cce783..e0c362fe 100644
--- a/backend/file.js
+++ b/backend/file.js
@@ -111,6 +111,10 @@ exports.mv = (oldPath, newPath) => {
     }
 }
 
+exports.exists = p => {
+    return fs.existsSync(resolvePath(p))
+}
+
 exports.upload = (file, path) => {
     exports.write(path, fs.readFileSync(file.path))
 }
diff --git a/backend/main.js b/backend/main.js
index bca5631e..fb426341 100644
--- a/backend/main.js
+++ b/backend/main.js
@@ -18,12 +18,20 @@ const fileContent = async (ctx, next) => {
         if (ctx.method === 'GET') {
             ctx.body = result('ok', '获取成功', file.read(ctx.query.path).toString())
         } else if (ctx.method === 'POST') {
+            if (ctx.request.body.is_new && file.exists(ctx.request.body.path)) {
+                throw new Error('文件已经存在')
+            }
+
             file.write(ctx.request.body.path, ctx.request.body.content)
             ctx.body = result()
         } else if (ctx.method === 'DELETE') {
             file.rm(ctx.query.path)
             ctx.body = result()
         } else if (ctx.method === 'PATCH') {
+            if (file.exists(ctx.request.body.newPath)) {
+                throw new Error('文件已经存在')
+            }
+
             file.mv(ctx.request.body.oldPath, ctx.request.body.newPath)
             ctx.body = result()
         }
@@ -108,12 +116,21 @@ app.use(bodyParser({
     jsonLimit: '20mb',
     textLimit: '20mb'
 }))
-app.use(async (ctx, next) => await fileContent(ctx, next))
-app.use(async (ctx, next) => await attachment(ctx, next))
-app.use(async (ctx, next) => await plantumlGen(ctx, next))
-app.use(async (ctx, next) => await runCode(ctx, next))
-app.use(async (ctx, next) => await convertFile(ctx, next))
-app.use(async (ctx, next) => await searchFile(ctx, next))
+
+const wrapper = async (ctx, next, fun) => {
+    try {
+        await fun(ctx, next)
+    } catch (error) {
+        ctx.body = result('error', error.message)
+    }
+}
+
+app.use(async (ctx, next) => await wrapper(ctx, next, fileContent))
+app.use(async (ctx, next) => await wrapper(ctx, next, attachment))
+app.use(async (ctx, next) => await wrapper(ctx, next, plantumlGen))
+app.use(async (ctx, next) => await wrapper(ctx, next, runCode))
+app.use(async (ctx, next) => await wrapper(ctx, next, convertFile))
+app.use(async (ctx, next) => await wrapper(ctx, next, searchFile))
 
 const port = 3000
 app.listen(port)
diff --git a/frontend/src/components/TreeNode.vue b/frontend/src/components/TreeNode.vue
index 8f138c56..784c73b8 100644
--- a/frontend/src/components/TreeNode.vue
+++ b/frontend/src/components/TreeNode.vue
@@ -73,11 +73,6 @@ export default {
         return
       }
 
-      if (this.item.children.find(x => x.name === filename)) {
-        window.alert('目标目录有同名文件存在')
-        return
-      }
-
       if (!filename.endsWith('.md')) {
         filename += '.md'
       }
@@ -87,7 +82,7 @@ export default {
         this.$emit('change', path)
       }, e => {
         alert(e.message)
-      })
+      }, true)
     },
     renameFile () {
       let newPath = window.prompt(`新文件名`, this.item.path)
diff --git a/frontend/src/file.js b/frontend/src/file.js
index 69288e4f..60feb516 100644
--- a/frontend/src/file.js
+++ b/frontend/src/file.js
@@ -66,11 +66,13 @@ export default {
               throw e
             }
           }
+        } else {
+          alert(result.message)
         }
       })
     })
   },
-  write: (path, content, call, ecall) => {
+  write: (path, content, call, ecall, isNew = false) => {
     try {
       if (path.endsWith('.c.md')) {
         content = encrypt(content)
@@ -86,11 +88,13 @@ export default {
     fetch('/api/file', {
       method: 'POST',
       headers: {'Content-Type': 'application/json'},
-      body: JSON.stringify({path, content})
+      body: JSON.stringify({path, content, is_new: isNew})
     }).then(response => {
       response.json().then(result => {
         if (result.status === 'ok') {
           call(result)
+        } else {
+          alert(result.message)
         }
       })
     })
@@ -104,6 +108,8 @@ export default {
       response.json().then(result => {
         if (result.status === 'ok') {
           call(result)
+        } else {
+          alert(result.message)
         }
       })
     })
@@ -113,6 +119,8 @@ export default {
       response.json().then(result => {
         if (result.status === 'ok') {
           call(result.data)
+        } else {
+          alert(result.message)
         }
       })
     })
@@ -122,6 +130,8 @@ export default {
       response.json().then(result => {
         if (result.status === 'ok') {
           call(result)
+        } else {
+          alert(result.message)
         }
       })
     })
@@ -144,6 +154,8 @@ export default {
         response.json().then(result => {
           if (result.status === 'ok') {
             call(result.data)
+          } else {
+            alert(result.message)
           }
         })
       })