diff --git a/app.js b/app.js
index 4b9eb6e..20e8fc1 100644
--- a/app.js
+++ b/app.js
@@ -11,6 +11,7 @@ const options = commandLineArgs(optionDefinitions);
 global.syzoj = {
   rootDir: __dirname,
   config: require('object-assign-deep')({}, require('./config-example.json'), require(options.config)),
+  languages: require('./language-config.json'),
   configDir: options.config,
   models: [],
   modules: [],
diff --git a/config-example.json b/config-example.json
index 8b3043e..edf2043 100644
--- a/config-example.json
+++ b/config-example.json
@@ -65,110 +65,25 @@
     "edit_contest_problem_list": 10,
     "edit_problem_tag_list": 10
   },
-  "languages": {
-    "cpp": {
-      "show": "C++",
-      "highlight": "cpp",
-      "version": "Clang 7.0.1",
-      "editor": "c_cpp"
-    },
-    "cpp11": {
-      "show": "C++ 11",
-      "highlight": "cpp",
-      "version": "Clang 7.0.1",
-      "editor": "c_cpp"
-    },
-    "cpp17": {
-      "show": "C++ 17",
-      "highlight": "cpp",
-      "version": "Clang 7.0.1",
-      "editor": "c_cpp"
-    },
-    "csharp": {
-      "show": "C#",
-      "highlight": "csharp",
-      "version": "Mono 5.16.0.220",
-      "editor": "csharp"
-    },
-    "c": {
-      "show": "C",
-      "highlight": "c",
-      "version": "Clang 7.0.1",
-      "editor": "c_cpp"
-    },
-    "vala": {
-      "show": "Vala",
-      "highlight": "vala",
-      "version": "Vala 0.40.8, Clang 7.0.1",
-      "editor": "vala"
-    },
-    "java": {
-      "show": "Java",
-      "highlight": "java",
-      "version": "OpenJDK 10.0.2",
-      "editor": "java"
-    },
-    "pascal": {
-      "show": "Pascal",
-      "highlight": "pascal",
-      "version": "Free Pascal 3.0.4",
-      "editor": "pascal"
-    },
-    "lua": {
-      "show": "Lua",
-      "highlight": "lua",
-      "version": "Lua 5.3.3",
-      "editor": "lua"
-    },
-    "luajit": {
-      "show": "LuaJIT",
-      "highlight": "lua",
-      "version": "LuaJIT 2.1.0",
-      "editor": "lua"
-    },
-    "python2": {
-      "show": "Python 2",
-      "highlight": "python",
-      "version": "PyPy 6.0.0 (Python 2.7.13)",
-      "editor": "python"
-    },
-    "python3": {
-      "show": "Python 3",
-      "highlight": "python",
-      "version": "PyPy 6.0.0 (Python 3.5.3)",
-      "editor": "python"
-    },
-    "nodejs": {
-      "show": "Node.js",
-      "highlight": "js",
-      "version": "10.14.0",
-      "editor": "javascript"
-    },
-    "ruby": {
-      "show": "Ruby",
-      "highlight": "ruby",
-      "version": "2.5.1",
-      "editor": "ruby"
-    },
-    "haskell": {
-      "show": "Haskell",
-      "highlight": "haskell",
-      "version": "GHC 8.6.2",
-      "editor": "haskell"
-    },
-    "ocaml": {
-      "show": "OCaml",
-      "highlight": "ocaml",
-      "version": "Ocaml 4.05.0",
-      "editor": "ocaml"
-    },
-    "vbnet": {
-      "show": "Visual Basic",
-      "highlight": "vbnet",
-      "version": "Mono 4.7",
-      "editor": "vbscript"
-    }
-  },
+  "enabled_languages": [
+    "cpp",
+    "cpp11",
+    "cpp17",
+    "csharp",
+    "c",
+    "vala",
+    "java",
+    "pascal",
+    "lua",
+    "luajit",
+    "python2",
+    "python3",
+    "nodejs",
+    "ruby",
+    "haskell",
+    "ocaml",
+    "vbnet"
+  ],
   "links": [
     {
       "title": "LibreOJ",
diff --git a/language-config.json b/language-config.json
new file mode 100644
index 0000000..e663b60
--- /dev/null
+++ b/language-config.json
@@ -0,0 +1,104 @@
+{
+  "cpp": {
+    "show": "C++",
+    "highlight": "cpp",
+    "version": "Clang 7.0.1",
+    "editor": "c_cpp"
+  },
+  "cpp11": {
+    "show": "C++ 11",
+    "highlight": "cpp",
+    "version": "Clang 7.0.1",
+    "editor": "c_cpp"
+  },
+  "cpp17": {
+    "show": "C++ 17",
+    "highlight": "cpp",
+    "version": "Clang 7.0.1",
+    "editor": "c_cpp"
+  },
+  "csharp": {
+    "show": "C#",
+    "highlight": "csharp",
+    "version": "Mono 5.16.0.220",
+    "editor": "csharp"
+  },
+  "c": {
+    "show": "C",
+    "highlight": "c",
+    "version": "Clang 7.0.1",
+    "editor": "c_cpp"
+  },
+  "vala": {
+    "show": "Vala",
+    "highlight": "vala",
+    "version": "Vala 0.40.8, Clang 7.0.1",
+    "editor": "vala"
+  },
+  "java": {
+    "show": "Java",
+    "highlight": "java",
+    "version": "OpenJDK 10.0.2",
+    "editor": "java"
+  },
+  "pascal": {
+    "show": "Pascal",
+    "highlight": "pascal",
+    "version": "Free Pascal 3.0.4",
+    "editor": "pascal"
+  },
+  "lua": {
+    "show": "Lua",
+    "highlight": "lua",
+    "version": "Lua 5.3.3",
+    "editor": "lua"
+  },
+  "luajit": {
+    "show": "LuaJIT",
+    "highlight": "lua",
+    "version": "LuaJIT 2.1.0",
+    "editor": "lua"
+  },
+  "python2": {
+    "show": "Python 2",
+    "highlight": "python",
+    "version": "PyPy 6.0.0 (Python 2.7.13)",
+    "editor": "python"
+  },
+  "python3": {
+    "show": "Python 3",
+    "highlight": "python",
+    "version": "PyPy 6.0.0 (Python 3.5.3)",
+    "editor": "python"
+  },
+  "nodejs": {
+    "show": "Node.js",
+    "highlight": "js",
+    "version": "10.14.0",
+    "editor": "javascript"
+  },
+  "ruby": {
+    "show": "Ruby",
+    "highlight": "ruby",
+    "version": "2.5.1",
+    "editor": "ruby"
+  },
+  "haskell": {
+    "show": "Haskell",
+    "highlight": "haskell",
+    "version": "GHC 8.6.2",
+    "editor": "haskell"
+  },
+  "ocaml": {
+    "show": "OCaml",
+    "highlight": "ocaml",
+    "version": "Ocaml 4.05.0",
+    "editor": "ocaml"
+  },
+  "vbnet": {
+    "show": "Visual Basic",
+    "highlight": "vbnet",
+    "version": "Mono 4.7",
+    "editor": "vbscript"
+  }
+}
diff --git a/libs/submissions_process.js b/libs/submissions_process.js
index faa5714..2eeb679 100644
--- a/libs/submissions_process.js
+++ b/libs/submissions_process.js
@@ -5,7 +5,7 @@ const getSubmissionInfo = (s, displayConfig) => ({
     userId: s.user_id,
     problemName: s.problem.title,
     problemId: s.problem_id,
-    language: displayConfig.showCode ? ((s.language != null && s.language !== '') ? syzoj.config.languages[s.language].show : null) : null,
+    language: displayConfig.showCode ? ((s.language != null && s.language !== '') ? syzoj.languages[s.language].show : null) : null,
     codeSize: displayConfig.showCode ? syzoj.utils.formatSize(s.code_length) : null,
     submitTime: syzoj.utils.formatDate(s.submit_time),
 });
diff --git a/modules/contest.js b/modules/contest.js
index 9a9165d..303de97 100644
--- a/modules/contest.js
+++ b/modules/contest.js
@@ -412,7 +412,7 @@ app.get('/contest/submission/:id', async (req, res) => {
 
     if (judge.problem.type !== 'submit-answer') {
       judge.codeLength = judge.code.length;
-      judge.code = await syzoj.utils.highlight(judge.code, syzoj.config.languages[judge.language].highlight);
+      judge.code = await syzoj.utils.highlight(judge.code, syzoj.languages[judge.language].highlight);
     }
 
     res.render('submission', {
diff --git a/modules/problem.js b/modules/problem.js
index fe42845..6a01cf3 100644
--- a/modules/problem.js
+++ b/modules/problem.js
@@ -592,7 +592,7 @@ app.post('/problem/:id/submit', app.multer.fields([{ name: 'answer', maxCount: 1
     const curUser = res.locals.user;
 
     if (!problem) throw new ErrorMessage('无此题目。');
-    if (problem.type !== 'submit-answer' && !syzoj.config.languages[req.body.language]) throw new ErrorMessage('不支持该语言。');
+    if (problem.type !== 'submit-answer' && !syzoj.languages[req.body.language]) throw new ErrorMessage('不支持该语言。');
     if (!curUser) throw new ErrorMessage('请登录后继续。', { '登录': syzoj.utils.makeUrl(['login'], { 'url': syzoj.utils.makeUrl(['problem', id]) }) });
 
     let judge_state;
diff --git a/modules/submission.js b/modules/submission.js
index 27146c8..c602d42 100644
--- a/modules/submission.js
+++ b/modules/submission.js
@@ -147,7 +147,7 @@ app.get('/submission/:id', async (req, res) => {
 
     if (judge.problem.type !== 'submit-answer') {
       judge.codeLength = judge.code.length;
-      judge.code = await syzoj.utils.highlight(judge.code, syzoj.config.languages[judge.language].highlight);
+      judge.code = await syzoj.utils.highlight(judge.code, syzoj.languages[judge.language].highlight);
     }
 
     displayConfig.showRejudge = await judge.problem.isAllowedEditBy(res.locals.user);
diff --git a/views/admin_rejudge.ejs b/views/admin_rejudge.ejs
index f300906..d1b6cf2 100644
--- a/views/admin_rejudge.ejs
+++ b/views/admin_rejudge.ejs
@@ -19,8 +19,8 @@
         <div class="menu">
           <div class="item" data-value="">不限</div>
           <div class="item" data-value="submit-answer">提交答案</div>
-          <% for (let lang in syzoj.config.languages) { %>
-            <div class="item" data-value="<%= lang %>"><%= syzoj.config.languages[lang].show %></div>
+          <% for (let lang of syzoj.config.enabled_languages) { %>
+            <div class="item" data-value="<%= lang %>"><%= syzoj.languages[lang].show %></div>
           <% } %>
         </div>
       </div>
diff --git a/views/problem.ejs b/views/problem.ejs
index ea311d3..ea20c25 100644
--- a/views/problem.ejs
+++ b/views/problem.ejs
@@ -310,15 +310,15 @@ div[class*=ace_br] {
                 <div class="four wide column" style="margin-right: -25px; ">
                   <div class="ui attached vertical fluid pointing menu" id="languages-menu" style="height: 370px; overflow-y: scroll; overflow-x: hidden; ">
                     <%
-                    let language = Object.getOwnPropertyNames(syzoj.config.languages).shift();
+                    let language = syzoj.config.enabled_languages;;
                     if (state) {
                       language = state.language;
                     } else if (lastLanguage) language = lastLanguage;
                     %>
-                    <% for (lang in syzoj.config.languages) { %>
-                      <a class="item<%= lang === language ? ' active' : '' %>" data-value="<%= lang %>" data-mode="<%= syzoj.config.languages[lang].editor %>">
-                        <%= syzoj.config.languages[lang].show %>
-                        <div class="ui right floated" style="opacity: 0.4; margin-top: 8px; font-size: 0.7em; "><%= syzoj.config.languages[lang].version %></div>
+                    <% for (lang of syzoj.config.enabled_languages) { %>
+                      <a class="item<%= lang === language ? ' active' : '' %>" data-value="<%= lang %>" data-mode="<%= syzoj.languages[lang].editor %>">
+                        <%= syzoj.languages[lang].show %>
+                        <div class="ui right floated" style="opacity: 0.4; margin-top: 8px; font-size: 0.7em; "><%= syzoj.languages[lang].version %></div>
                       </a>
                     <% } %>
                   </div>
diff --git a/views/statistics.ejs b/views/statistics.ejs
index bf1adea..41746fd 100644
--- a/views/statistics.ejs
+++ b/views/statistics.ejs
@@ -83,7 +83,7 @@ function getColorOfScore(score) {
               <% if (problem.type !== 'submit-answer') { %>
                 <td><%= judge.total_time %> ms</td>
                 <td><%= parseInt(judge.max_memory) || 0 %> K</td>
-                <td><a href="<%= syzoj.utils.makeUrl(['submission', judge.id]) %>"><%= syzoj.config.languages[judge.language].show %></a> / <%= syzoj.utils.formatSize(judge.code.length) %></td>
+                <td><a href="<%= syzoj.utils.makeUrl(['submission', judge.id]) %>"><%= syzoj.languages[judge.language].show %></a> / <%= syzoj.utils.formatSize(judge.code.length) %></td>
               <% } else { %>
                 <td><%= syzoj.utils.formatSize(judge.max_memory) %></td>
               <% } %>
diff --git a/views/submissions.ejs b/views/submissions.ejs
index 1ce55e9..f9fae7d 100644
--- a/views/submissions.ejs
+++ b/views/submissions.ejs
@@ -38,8 +38,8 @@
           <div class="menu">
             <div class="item" data-value=""><b>不限</b></div>
             <div class="item" data-value="submit-answer"><b>提交答案</b></div>
-            <% for (let lang in syzoj.config.languages) { %>
-              <div class="item" data-value="<%= lang %>"><b><%= syzoj.config.languages[lang].show %></b></div>
+            <% for (let lang of syzoj.config.enabled_languages) { %>
+              <div class="item" data-value="<%= lang %>"><b><%= syzoj.languages[lang].show %></b></div>
             <% } %>
           </div>
         </div>