diff --git a/hydro/model/contest.js b/hydro/model/contest.js
index 6973f96f4..5605b03b4 100644
--- a/hydro/model/contest.js
+++ b/hydro/model/contest.js
@@ -6,12 +6,190 @@ const {
 } = require('../error');
 const { PERM_VIEW_CONTEST_HIDDEN_SCOREBOARD } = require('../permission');
 const validator = require('../lib/validator');
+const ranked = require('../lib/rank');
 const db = require('../service/db');
 
 const coll = db.collection('contest');
 const collStatus = db.collection('contest.status');
 
-const RULES = {};
+const acm = {
+    TEXT: 'ACM/ICPC',
+    check: () => { },
+    showScoreboard: () => true,
+    showRecord: (tdoc, now) => now > tdoc.endAt,
+    stat: (tdoc, journal) => {
+        const naccept = {};
+        const effective = {};
+        const detail = [];
+        let accept = 0;
+        let time = 0;
+        for (const j in journal) {
+            if (tdoc.pids.includes(j.pid)
+                && !(effective.includes(j.pid) && effective[j.pid].accept)) {
+                effective[j.pid] = j;
+            }
+            if (!j.accept) naccept[j.pid]++;
+        }
+        function _time(jdoc) {
+            const real = jdoc.rid.generationTime - Math.floor(tdoc.begin_at / 1000);
+            const penalty = 20 * 60 * naccept[jdoc.pid];
+            return real + penalty;
+        }
+        for (const j of effective) detail.push({ ...j, naccept: naccept[j.pid], time: _time(j) });
+        for (const d of detail) {
+            accept += d.accept;
+            if (d.accept) time += d.time;
+        }
+        return { accept, time, detail };
+    },
+    scoreboard(isExport, _, tdoc, rankedTsdocs, udict, pdict) {
+        const columns = [
+            { type: 'rank', value: _('Rank') },
+            { type: 'user', value: _('User') },
+            { type: 'solved_problems', value: _('Solved Problems') },
+        ];
+        if (isExport) {
+            columns.push({ type: 'total_time', value: _('Total Time (Seconds)') });
+            columns.push({ type: 'total_time_str', value: _('Total Time') });
+        }
+        for (const i in tdoc.pids) {
+            if (isExport) {
+                columns.push({
+                    type: 'problem_flag',
+                    value: '#{0} {1}'.format(i + 1, pdict[tdoc.pids[i]].title),
+                });
+                columns.push({
+                    type: 'problem_time',
+                    value: '#{0} {1}'.format(i + 1, _('Time (Seconds)')),
+                });
+                columns.push({
+                    type: 'problem_time_str',
+                    value: '#{0} {1}'.format(i + 1, _('Time')),
+                });
+            } else {
+                columns.push({
+                    type: 'problem_detail',
+                    value: '#{0}'.format(i + 1),
+                    raw: pdict[tdoc.pids[i]],
+                });
+            }
+        }
+        const rows = [columns];
+        for (const [rank, tsdoc] of rankedTsdocs) {
+            const tsddict = {};
+            if (tdoc.detail) { for (const item of tsdoc.detail) tsddict[item.pid] = item; }
+            const row = [];
+            row.push(
+                { type: 'string', value: rank },
+                { type: 'user', value: udict[tsdoc.uid].uname, raw: udict[tsdoc.uid] },
+                { type: 'string', value: tsdoc.accept || 0 },
+            );
+            if (isExport) {
+                row.push(
+                    { type: 'string', value: tsdoc.time || 0.0 },
+                    { type: 'string', value: tsdoc.time || 0.0 },
+                );
+            }
+            for (const pid of tdoc.pids) {
+                let rdoc;
+                let colAccepted;
+                let colTime;
+                let colTimeStr;
+                if ((tsddict[pid] || {}).accept) {
+                    rdoc = tsddict[pid].rid;
+                    colAccepted = _('Accepted');
+                    colTime = tsddict[pid].time;
+                    colTimeStr = colTime;
+                } else {
+                    rdoc = null;
+                    colAccepted = '-';
+                    colTime = '-';
+                    colTimeStr = '-';
+                }
+                if (isExport) {
+                    row.push({ type: 'string', value: colAccepted });
+                    row.push({ type: 'string', value: colTime });
+                    row.push({ type: 'string', value: colTimeStr });
+                } else {
+                    row.push({
+                        type: 'record',
+                        value: '{0}\n{1}'.format(colAccepted, colTimeStr),
+                        raw: rdoc,
+                    });
+                }
+                rows.push(row);
+            }
+        }
+        return rows;
+    },
+};
+
+const oi = {
+    TEXT: 'OI',
+    check: () => { },
+    stat: (tdoc, journal) => {
+        const detail = {};
+        let score = 0;
+        for (const j in journal) {
+            if (tdoc.pids.includes(j.pid)) {
+                detail[j.pid] = j;
+                score += j.score;
+            }
+        }
+        return { score, detail };
+    },
+    showScoreboard(tdoc, now) {
+        return now > tdoc.endAt;
+    },
+    showRecord(tdoc, now) {
+        return now > tdoc.endAt;
+    },
+    scoreboard(isExport, _, tdoc, rankedTsdocs, udict, pdict) {
+        const columns = [
+            { type: 'rank', value: _('Rank') },
+            { type: 'user', value: _('User') },
+            { type: 'total_score', value: _('Total Score') },
+        ];
+        for (const i in tdoc.pids) {
+            if (isExport) {
+                columns.push({
+                    type: 'problem_score',
+                    value: '#{0} {1}'.format(i + 1, pdict[tdoc.pids[i]].title),
+                });
+            } else {
+                columns.push({
+                    type: 'problem_detail',
+                    value: '#{0}'.format(i + 1),
+                    raw: pdict[tdoc.pids[i]],
+                });
+            }
+        }
+        const rows = [columns];
+        for (const [rank, tsdoc] of rankedTsdocs) {
+            const tsddict = {};
+            if (tsdoc.journal) { for (const item of tsdoc.journal) tsddict[item.pid] = item; }
+            const row = [];
+            row.push({ type: 'string', value: rank });
+            row.push({ type: 'user', value: udict[tsdoc.uid].uname, raw: udict[tsdoc.uid] });
+            row.push({ type: 'string', value: tsdoc.score || 0 });
+            for (const pid of tdoc.pids) {
+                row.push({
+                    type: 'record',
+                    value: (tsddict[pid] || {}).score || '-',
+                    raw: (tsddict[pid] || {}).rid || null,
+                });
+            }
+            rows.push(row);
+        }
+        return rows;
+    },
+    rank: (tdocs) => ranked(tdocs, (a, b) => a.score === b.score),
+};
+
+
+const RULES = {
+    acm, oi,
+};
 
 /**
  * @typedef {import('bson').ObjectID} ObjectID
@@ -164,7 +342,7 @@ const ContestHandlerMixin = (c) => class extends c {
     }
 };
 
-module.exports = {
+global.Hydro['model.contest'] = module.exports = {
     RULES,
     ContestHandlerMixin,
     add,
@@ -198,8 +376,6 @@ module.exports = {
                 : 'finished'),
 };
 
-global.Hydro['model.contest'] = module.exports;
-
 /*
 
 def _get_status_journal(tsdoc):
diff --git a/module/contest-rule-basic/acm.js b/module/contest-rule-basic/acm.js
deleted file mode 100644
index b6c8d55f8..000000000
--- a/module/contest-rule-basic/acm.js
+++ /dev/null
@@ -1,111 +0,0 @@
-module.exports = {
-    TEXT: 'ACM/ICPC',
-    check: () => { },
-    showScoreboard: () => true,
-    showRecord: (tdoc, now) => now > tdoc.endAt,
-    stat: (tdoc, journal) => {
-        const naccept = {};
-        const effective = {};
-        const detail = [];
-        let accept = 0;
-        let time = 0;
-        for (const j in journal) {
-            if (tdoc.pids.includes(j.pid)
-            && !(effective.includes(j.pid) && effective[j.pid].accept)) {
-                effective[j.pid] = j;
-            }
-            if (!j.accept) naccept[j.pid]++;
-        }
-        function _time(jdoc) {
-            const real = jdoc.rid.generationTime - Math.floor(tdoc.begin_at / 1000);
-            const penalty = 20 * 60 * naccept[jdoc.pid];
-            return real + penalty;
-        }
-        for (const j of effective) detail.push({ ...j, naccept: naccept[j.pid], time: _time(j) });
-        for (const d of detail) {
-            accept += d.accept;
-            if (d.accept) time += d.time;
-        }
-        return { accept, time, detail };
-    },
-    scoreboard(isExport, _, tdoc, rankedTsdocs, udict, pdict) {
-        const columns = [
-            { type: 'rank', value: _('Rank') },
-            { type: 'user', value: _('User') },
-            { type: 'solved_problems', value: _('Solved Problems') },
-        ];
-        if (isExport) {
-            columns.push({ type: 'total_time', value: _('Total Time (Seconds)') });
-            columns.push({ type: 'total_time_str', value: _('Total Time') });
-        }
-        for (const i in tdoc.pids) {
-            if (isExport) {
-                columns.push({
-                    type: 'problem_flag',
-                    value: '#{0} {1}'.format(i + 1, pdict[tdoc.pids[i]].title),
-                });
-                columns.push({
-                    type: 'problem_time',
-                    value: '#{0} {1}'.format(i + 1, _('Time (Seconds)')),
-                });
-                columns.push({
-                    type: 'problem_time_str',
-                    value: '#{0} {1}'.format(i + 1, _('Time')),
-                });
-            } else {
-                columns.push({
-                    type: 'problem_detail',
-                    value: '#{0}'.format(i + 1),
-                    raw: pdict[tdoc.pids[i]],
-                });
-            }
-        }
-        const rows = [columns];
-        for (const [rank, tsdoc] of rankedTsdocs) {
-            const tsddict = {};
-            if (tdoc.detail) { for (const item of tsdoc.detail) tsddict[item.pid] = item; }
-            const row = [];
-            row.push(
-                { type: 'string', value: rank },
-                { type: 'user', value: udict[tsdoc.uid].uname, raw: udict[tsdoc.uid] },
-                { type: 'string', value: tsdoc.accept || 0 },
-            );
-            if (isExport) {
-                row.push(
-                    { type: 'string', value: tsdoc.time || 0.0 },
-                    { type: 'string', value: tsdoc.time || 0.0 },
-                );
-            }
-            for (const pid of tdoc.pids) {
-                let rdoc;
-                let colAccepted;
-                let colTime;
-                let colTimeStr;
-                if ((tsddict[pid] || {}).accept) {
-                    rdoc = tsddict[pid].rid;
-                    colAccepted = _('Accepted');
-                    colTime = tsddict[pid].time;
-                    colTimeStr = colTime;
-                } else {
-                    rdoc = null;
-                    colAccepted = '-';
-                    colTime = '-';
-                    colTimeStr = '-';
-                }
-                if (isExport) {
-                    row.push({ type: 'string', value: colAccepted });
-                    row.push({ type: 'string', value: colTime });
-                    row.push({ type: 'string', value: colTimeStr });
-                } else {
-                    row.push({
-                        type: 'record',
-                        value: '{0}\n{1}'.format(colAccepted, colTimeStr),
-                        raw: rdoc,
-                    });
-                }
-                rows.push(row);
-            }
-        }
-        return rows;
-    },
-};
diff --git a/module/contest-rule-basic/hydro.json b/module/contest-rule-basic/hydro.json
deleted file mode 100644
index f1f7c1d84..000000000
--- a/module/contest-rule-basic/hydro.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-    "name": "contest-rule-basic",
-    "version": "1.0.0",
-    "description": "Provide contest rules: ACM/ICPC and OI."
-}
\ No newline at end of file
diff --git a/module/contest-rule-basic/locale/zh_CN.yaml b/module/contest-rule-basic/locale/zh_CN.yaml
deleted file mode 100644
index 102f39267..000000000
--- a/module/contest-rule-basic/locale/zh_CN.yaml
+++ /dev/null
@@ -1 +0,0 @@
-'Provide contest rules: ACM/ICPC and OI.': 提供ACM和OI赛制。
\ No newline at end of file
diff --git a/module/contest-rule-basic/model.js b/module/contest-rule-basic/model.js
deleted file mode 100644
index 77d995248..000000000
--- a/module/contest-rule-basic/model.js
+++ /dev/null
@@ -1,6 +0,0 @@
-const acm = require('./acm');
-const oi = require('./oi');
-
-const rules = global.Hydro['model.contest'].RULES;
-rules.oi = oi;
-rules.acm = acm;
diff --git a/module/contest-rule-basic/oi.js b/module/contest-rule-basic/oi.js
deleted file mode 100644
index 1e8813cb1..000000000
--- a/module/contest-rule-basic/oi.js
+++ /dev/null
@@ -1,66 +0,0 @@
-/**
- * @type {import('../../hydro/lib/rank')}
- */
-const ranked = global.Hydro['lib.rank'];
-
-module.exports = {
-    TEXT: 'OI',
-    check: () => { },
-    stat: (tdoc, journal) => {
-        const detail = {};
-        let score = 0;
-        for (const j in journal) {
-            if (tdoc.pids.includes(j.pid)) {
-                detail[j.pid] = j;
-                score += j.score;
-            }
-        }
-        return { score, detail };
-    },
-    showScoreboard(tdoc, now) {
-        return now > tdoc.endAt;
-    },
-    showRecord(tdoc, now) {
-        return now > tdoc.endAt;
-    },
-    scoreboard(isExport, _, tdoc, rankedTsdocs, udict, pdict) {
-        const columns = [
-            { type: 'rank', value: _('Rank') },
-            { type: 'user', value: _('User') },
-            { type: 'total_score', value: _('Total Score') },
-        ];
-        for (const i in tdoc.pids) {
-            if (isExport) {
-                columns.push({
-                    type: 'problem_score',
-                    value: '#{0} {1}'.format(i + 1, pdict[tdoc.pids[i]].title),
-                });
-            } else {
-                columns.push({
-                    type: 'problem_detail',
-                    value: '#{0}'.format(i + 1),
-                    raw: pdict[tdoc.pids[i]],
-                });
-            }
-        }
-        const rows = [columns];
-        for (const [rank, tsdoc] of rankedTsdocs) {
-            const tsddict = {};
-            if (tsdoc.journal) { for (const item of tsdoc.journal) tsddict[item.pid] = item; }
-            const row = [];
-            row.push({ type: 'string', value: rank });
-            row.push({ type: 'user', value: udict[tsdoc.uid].uname, raw: udict[tsdoc.uid] });
-            row.push({ type: 'string', value: tsdoc.score || 0 });
-            for (const pid of tdoc.pids) {
-                row.push({
-                    type: 'record',
-                    value: (tsddict[pid] || {}).score || '-',
-                    raw: (tsddict[pid] || {}).rid || null,
-                });
-            }
-            rows.push(row);
-        }
-        return rows;
-    },
-    rank: (tdocs) => ranked(tdocs, (a, b) => a.score === b.score),
-};
diff --git a/module/wiki/raw/development/basic.md b/module/wiki/raw/development/basic.md
index b31a35a4e..d51ff674d 100644
--- a/module/wiki/raw/development/basic.md
+++ b/module/wiki/raw/development/basic.md
@@ -2,3 +2,11 @@
 
 Hydro 后端使用 NodeJS 编写，前端使用 JQuery + React。
 代码风格遵循 airbnb 标准（详见 .eslintrc.js）。
+
+由于模块中不能使用 require() 引入 Hydro 的文件，因此需要从 global.Hydro 中取出需要的模块。  
+例： 
+
+```js
+const { db } = global.Hydro.service;
+const { problem } = global.Hydro.model;
+```
diff --git a/module/wiki/raw/development/contents.json b/module/wiki/raw/development/contents.json
index 4c2610c37..439a1cae8 100644
--- a/module/wiki/raw/development/contents.json
+++ b/module/wiki/raw/development/contents.json
@@ -1,8 +1,11 @@
 [
     "basic",
     "module",
+    "hydro",
     "handler",
     "service",
+    "lib",
     "file",
+    "locale",
     "template"
 ]
\ No newline at end of file
diff --git a/module/wiki/raw/development/hydro.md b/module/wiki/raw/development/hydro.md
new file mode 100644
index 000000000..6872e2904
--- /dev/null
+++ b/module/wiki/raw/development/hydro.md
@@ -0,0 +1,11 @@
+# Hydro.json
+
+Hydro.json 是模块的声明文件，格式如下。  
+
+```json
+{
+    "id": "模块ID",
+    "version": "模块版本",
+    "description": "模块描述"
+}
+```
diff --git a/module/wiki/raw/development/lib.md b/module/wiki/raw/development/lib.md
new file mode 100644
index 000000000..4cdd0ff62
--- /dev/null
+++ b/module/wiki/raw/development/lib.md
@@ -0,0 +1,3 @@
+# Lib
+
+库文件。通常用于提供一些功能（废话）。
diff --git a/module/wiki/raw/development/locale.md b/module/wiki/raw/development/locale.md
new file mode 100644
index 000000000..e97db3123
--- /dev/null
+++ b/module/wiki/raw/development/locale.md
@@ -0,0 +1,3 @@
+# Locale
+
+用于提供多国翻译。格式与 Hydro 的 locale 文件夹格式相同。
diff --git a/module/wiki/raw/development/template.md b/module/wiki/raw/development/template.md
index 73676252b..b75f6f517 100644
--- a/module/wiki/raw/development/template.md
+++ b/module/wiki/raw/development/template.md
@@ -1,5 +1,31 @@
 # Template
 
-页面模板。
+页面模板，使用 nunjucks 语法。  
+传入了 _ 翻译函数与 model 等。
 
-TODO
\ No newline at end of file
+```html
+{% set page_name = "page_name" %}
+{% extends "layout/basic.html" %}
+{% block content %}
+<div class="error__container clearfix">
+  <div class="error__icon-container">
+    <div class="error__twd2"></div>
+  </div>
+  <div class="error__text-container">
+    <h1>{{ _('Oops!') }}</h1>
+    <p>{{ _(error.message).format(error.params) }}</p>
+    <p>{{ _('Technical Information') }}:</p>
+    <p>{{ _('Type') }}: {{ error.code }}</p>
+    <p>{{ _('Arguments') }}:
+      <ol>
+      {% for param in error.params %}
+        <li>{{ param }}</li>
+      {% endfor %}
+      </ol>
+    </p>
+  </div>
+</div>
+{% endblock %}
+```
+
+<blockquote class="note">请不要覆盖已有模板。</blockquote>
\ No newline at end of file