diff --git a/config-example.json b/config-example.json
index 05a2515..67ebe62 100644
--- a/config-example.json
+++ b/config-example.json
@@ -29,12 +29,32 @@
     "contest": 10,
     "edit_contest_problem_list": 10
   },
-  "languages": [
-    "C++",
-    "C#",
-    "C",
-    "Pascal"
-  ],
+  "languages": {
+    "cpp": {
+      "show": "C++",
+      "highlight": "cpp"
+    },
+    "cpp11": {
+      "show": "C++11",
+      "highlight": "cpp"
+    },
+    "csharp": {
+      "show": "C#",
+      "highlight": "csharp"
+    },
+    "c": {
+      "show": "C",
+      "highlight": "c"
+    },
+    "pascal": {
+      "show": "Pascal",
+      "highlight": "pascal"
+    },
+    "vbnet": {
+      "show": "Visual Basic",
+      "highlight": "vbnet"
+    }
+  },
   "notices": [
     {
       "type": "// article",
diff --git a/modules/judge.js b/modules/judge.js
index f83e7a7..8509d03 100644
--- a/modules/judge.js
+++ b/modules/judge.js
@@ -75,7 +75,7 @@ app.get('/judge_detail/:id', async (req, res) => {
     let id = parseInt(req.params.id);
     let judge = await JudgeState.fromID(id);
 
-    judge.code = await syzoj.utils.highlight(judge.code, judge.language);
+    judge.code = await syzoj.utils.highlight(judge.code, syzoj.config.languages[judge.language].highlight);
     if (judge.result.compiler_output) judge.result.compiler_output = syzoj.utils.ansiToHTML(judge.result.compiler_output);
     judge.allowedSeeResult = await judge.isAllowedSeeResultBy(res.locals.user);
     judge.allowedSeeCode = await judge.isAllowedSeeCodeBy(res.locals.user);
@@ -96,7 +96,7 @@ app.get('/judge_detail/:id/ajax', async (req, res) => {
     let id = parseInt(req.params.id);
     let judge = await JudgeState.fromID(id);
 
-    judge.code = await syzoj.utils.highlight(judge.code, judge.language);
+    judge.code = await syzoj.utils.highlight(judge.code, syzoj.config.languages[judge.language].highlight);
     if (judge.result.compiler_output) judge.result.compiler_output = syzoj.utils.ansiToHTML(judge.result.compiler_output);
     judge.allowedSeeResult = await judge.isAllowedSeeResultBy(res.locals.user);
     judge.allowedSeeCode = await judge.isAllowedSeeCodeBy(res.locals.user);
diff --git a/modules/problem.js b/modules/problem.js
index 0f2e3d9..a38a7e1 100644
--- a/modules/problem.js
+++ b/modules/problem.js
@@ -208,6 +208,7 @@ app.post('/submit/:id', async (req, res) => {
     let problem = await Problem.fromID(id);
 
     if (!problem) throw 'No such problem.';
+    if (!syzoj.config.languages[req.body.language]) throw 'No such language.'
     if (!res.locals.user) throw 'Please login.';
     if (!await problem.isAllowedUseBy(res.locals.user)) throw 'Permission denied.';
 
diff --git a/views/contest_problem.ejs b/views/contest_problem.ejs
index e04f829..7fc4fca 100644
--- a/views/contest_problem.ejs
+++ b/views/contest_problem.ejs
@@ -63,8 +63,8 @@
    <div class="field">
    <label for="doc-select-1">选择语言</label>
    <select class="ui fluid dropdown" name="language" id="doc-select-1">
-     <% for (lang of syzoj.config.languages) { %>
-         <option value="<%= lang %>"><%= lang %></option>
+     <% for (lang in syzoj.config.languages) { %>
+         <option value="<%= lang %>"><%= syzoj.config.languages[lang].show %></option>
      <% } %>
    </select>
    </div>
diff --git a/views/judge_detail_item.ejs b/views/judge_detail_item.ejs
index b02d2c2..d7d6095 100644
--- a/views/judge_detail_item.ejs
+++ b/views/judge_detail_item.ejs
@@ -25,7 +25,7 @@
           <td class="score score_<%= parseInt(judge.result.score / 10) || 0 %>"><%= judge.result.score %></td>
           <td><%= judge.result.total_time %> ms</td>
           <td><%= judge.result.max_memory %> KiB</td>
-          <td><%= judge.language %></td>
+          <td><%= syzoj.config.languages[judge.language].show %></td>
         <% } else { %>
           <td>隐藏</td>
           <td>隐藏</td>
diff --git a/views/judge_state_item.ejs b/views/judge_state_item.ejs
index 0fa8c84..33bb249 100644
--- a/views/judge_state_item.ejs
+++ b/views/judge_state_item.ejs
@@ -11,7 +11,7 @@
 <td><a href="<%= syzoj.utils.makeUrl(['judge_detail', judge.id]) %>"><span class="score score_<%= parseInt(judge.result.score / 10) || 0 %>"><%= judge.result.score %></span></a></td>
 <td><%= judge.result.total_time %> ms</td>
 <td><%= judge.result.max_memory %> KiB</td>
-<td><%= judge.language %></td>
+<td><%= syzoj.config.languages[judge.language].show %></td>
 <% } else { %>
     <td>隐藏</td>
     <td>隐藏</td>
diff --git a/views/submit.ejs b/views/submit.ejs
index 6fb6604..09774ce 100644
--- a/views/submit.ejs
+++ b/views/submit.ejs
@@ -6,8 +6,8 @@
     <div class="field">
   	  <label for="doc-select-1">选择语言</label>
 	    <select class="ui fluid dropdown" id="doc-select-1" name="language">
-        <% for (lang of syzoj.config.languages) { %>
-            <option value="<%= lang %>"><%= lang %></option>
+        <% for (lang in syzoj.config.languages) { %>
+            <option value="<%= lang %>"><%= syzoj.config.languages[lang].show %></option>
         <% } %>
 	  	</select>
     </div>