diff --git a/packages/fps-importer/handler.ts b/packages/fps-importer/handler.ts
index 59621195e..d994991eb 100644
--- a/packages/fps-importer/handler.ts
+++ b/packages/fps-importer/handler.ts
@@ -11,7 +11,7 @@ import { LocalProblemConfig } from 'hydrooj';
 import {
     Route, Handler, param, Types,
 } from 'hydrooj/dist/service/server';
-import { streamToBuffer } from 'hydrooj/dist/utils';
+import { buildContent, streamToBuffer } from 'hydrooj/dist/utils';
 import { ProblemAdd } from 'hydrooj/dist/lib/ui';
 import * as file from 'hydrooj/dist/model/file';
 import * as solution from 'hydrooj/dist/model/solution';
@@ -60,57 +60,22 @@ class FpsProblemImportHandler extends Handler {
         const problem = global.Hydro.model.problem;
         for (const p of result.fps.item) {
             const testdata = new AdmZip();
-            const content = [];
-            if (p.description) {
-                content.push(
-                    `<h2>${this.translate('Description')}</h2>`,
-                    ...p.description,
-                );
-            }
-            if (p.input) {
-                content.push(
-                    `<h2>${this.translate('Input Format')}</h2>`,
-                    ...p.input,
-                );
-            }
-            if (p.output) {
-                content.push(
-                    `<h2>${this.translate('Output Format')}</h2>`,
-                    ...p.output,
-                );
-            }
-            if (p.sample_input) {
-                if (p.sample_input.length === 1) {
-                    content.push(
-                        `<h2>${this.translate('Sample Input')}</h2>`,
-                        `<pre><code>${p.sample_input[0]}</code></pre>`,
-                        `<h2>${this.translate('Sample Output')}</h2>`,
-                        `<pre><code>${p.sample_output[0]}</code></pre>`,
-                    );
-                } else {
-                    for (let i = 0; i < p.sample_input.length; i++) {
-                        content.push(
-                            `<h2>${this.translate('Sample Input')}${i + 1}</h2>`,
-                            `<pre><code>${p.sample_input[i]}</code></pre>`,
-                            `<h2>${this.translate('Sample Output')}${i + 1}</h2>`,
-                            `<pre><code>${p.sample_output[i]}</code></pre>`,
-                        );
-                    }
-                }
-            }
-            if (p.hint) {
-                content.push(
-                    `<h2>${this.translate('Hint')}</h2>`,
-                    ...p.hint,
-                );
-            }
+            const content = buildContent({
+                description: p.description,
+                input: p.input,
+                output: p.output,
+                samples: p.sample_input
+                    ? p.sample_input.map((si: string, i: number) => [si, p.sample_output[i]])
+                    : [],
+                hint: p.hint,
+            }, 'html', this.translate.bind(this));
             const config: LocalProblemConfig = {
                 time: p.time_limit[0]._ + p.time_limit[0].$.unit,
                 memory: p.memory_limit[0]._ + p.memory_limit[0].$.unit,
             };
             const title = decodeHTML(p.title.join(' '));
             const tags = filter(p.source, (i: string) => i.trim());
-            const pid = await problem.add(domainId, null, title, content.join('\n'), this.user._id, tags, []);
+            const pid = await problem.add(domainId, null, title, content, this.user._id, tags, []);
             testdata.addFile('config.yaml', Buffer.from(`time: ${config.time}\nmemory: ${config.memory}`));
             if (p.test_output) {
                 for (let i = 0; i < p.test_input.length; i++) {
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index cd42bfc2d..f59dd468c 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.13.52",
+    "version": "2.13.53",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/utils.ts b/packages/hydrooj/src/utils.ts
index 815d2456d..a47df6f51 100644
--- a/packages/hydrooj/src/utils.ts
+++ b/packages/hydrooj/src/utils.ts
@@ -201,3 +201,71 @@ export function sleep(timeout: number) {
         }, timeout);
     });
 }
+
+function deepen(modifyString: (source: string) => string) {
+    function modifyObject<T>(source: T): T {
+        if (typeof source !== 'object' || !source) return source;
+        if (Array.isArray(source)) return source.map(modifyObject) as any;
+        const result = {} as T;
+        for (const key in source) {
+            result[modifyString(key)] = modifyObject(source[key]);
+        }
+        return result;
+    }
+
+    return function t<T>(source: T): T {
+        if (typeof source === 'string') {
+            return modifyString(source) as any;
+        }
+        return modifyObject(source);
+    };
+}
+
+export const camelCase = deepen((source) => source.replace(/[_-][a-z]/g, (str) => str.slice(1).toUpperCase()));
+export const paramCase = deepen((source) => source.replace(/_/g, '-').replace(/(?<!^)[A-Z]/g, (str) => `-${str.toLowerCase()}`));
+export const snakeCase = deepen((source) => source.replace(/-/g, '_').replace(/(?<!^)[A-Z]/g, (str) => `_${str.toLowerCase()}`));
+
+interface ProblemSource {
+    description?: string,
+    input?: string,
+    output?: string,
+    samples?: [string, string][],
+    hint?: string,
+    source?: string,
+}
+
+export function buildContent(source: ProblemSource, type: 'markdown' | 'html' = 'markdown', translate?: Function) {
+    const _ = translate || ((s: string) => s);
+    return type === 'html'
+        ? [
+            ...source.description ? [`<h2>${_('Description')}</h2>`, source.description] : [],
+            ...source.input ? [`<h2>${_('Input Format')}</h2>`, source.input] : [],
+            ...source.output ? [`<h2>'${_('Output Format')}</h2>`, source.output] : [],
+            ...(source.samples).map((sample, i) => [
+                `<h2>${_('Sample Input')} ${i + 1}</h2><pre>`,
+                sample[0],
+                `</pre><h2>${_('Sample Output')} ${i + 1}</h2><pre>`,
+                sample[1],
+                '</pre>',
+            ].join('\n')),
+            ...source.hint ? [`<h2>${_('Hint')}</h2>`, source.hint] : [],
+            ...source.source ? [`<h2>${_('Source')}</h2>`, source.source] : [],
+        ].join('\n')
+        : [
+            ...source.description ? [`## ${_('Description')}`, source.description] : [],
+            ...source.input ? [`## ${_('Input Format')}`, source.input] : [],
+            ...source.output ? [`## '${_('Output Format')}`, source.output] : [],
+            ...(source.samples).map((sample, i) => [
+                `## ${_('Sample Input')} ${i + 1}`,
+                '```',
+                sample[0],
+                '```',
+                `## ${_('Sample Output')} ${i + 1}`,
+                '```',
+                sample[1],
+                '```',
+            ].join('\n')),
+            ...source.hint ? [`## ${_('Hint')}`, source.hint] : [],
+            ...source.source ? [`## ${_('Source')}`, source.source] : [],
+        ].join('\n');
+}
diff --git a/packages/import-qduoj/handler.ts b/packages/import-qduoj/handler.ts
index bd4ded6fb..22256f3cf 100644
--- a/packages/import-qduoj/handler.ts
+++ b/packages/import-qduoj/handler.ts
@@ -10,7 +10,7 @@ import {
     Route, Handler, param, Types,
 } from 'hydrooj/dist/service/server';
 import { BadRequestError } from 'hydrooj/dist/error';
-import { streamToBuffer } from 'hydrooj/dist/utils';
+import { buildContent, streamToBuffer } from 'hydrooj/dist/utils';
 import { ProblemAdd } from 'hydrooj/dist/lib/ui';
 import * as file from 'hydrooj/dist/model/file';
 import * as problem from 'hydrooj/dist/model/problem';
@@ -31,36 +31,14 @@ class ImportQduojHandler extends Handler {
             for (const folder of folders) {
                 const buf = await fs.readFile(path.join(tmp, folder, 'problem.json'));
                 const pdoc = JSON.parse(buf.toString());
-                const content = [
-                    ...pdoc.description?.value
-                        ? [
-                            '<h2>Description</h2>',
-                            pdoc.description.value,
-                        ] : [],
-                    ...pdoc.input_description?.value
-                        ? [
-                            '<h2>Input Description</h2>',
-                            pdoc.input_description.value,
-                        ] : [],
-                    ...pdoc.output_description?.value
-                        ? [
-                            '<h2>Output Description</h2>',
-                            pdoc.output_description.value,
-                        ] : [],
-                    ...(pdoc.samples as any[]).map((sample, i) => [
-                        `<h2>Sample Input ${i + 1}</h2><pre>`,
-                        sample.input,
-                        `</pre><h2>Sample Output ${i + 1}</h2><pre>`,
-                        sample.output,
-                        '</pre>',
-                    ].join('\n')),
-                    ...pdoc.hint?.value
-                        ? [
-                            '<h2>Hint</h2>',
-                            pdoc.hint.value,
-                        ] : [],
-                    ...pdoc.source ? ['<h2>Source</h2>', pdoc.source] : [],
-                ].join('\n');
+                const content = buildContent({
+                    description: pdoc.description?.value,
+                    input: pdoc.input_description?.value,
+                    output: pdoc.output_description?.value,
+                    samples: pdoc.samples.map((i) => [i.input, i.output]),
+                    hint: pdoc.hint?.value,
+                    source: pdoc.source?.value,
+                }, 'html');
                 const pid = await problem.add(domainId, pdoc.display_id, pdoc.title, content, this.user._id, pdoc.tags);
                 const testdata = new AdmZip();
                 const config: LocalProblemConfig = {
diff --git a/packages/migrate-hustoj/script.ts b/packages/migrate-hustoj/script.ts
index 7cd206569..849593dbe 100644
--- a/packages/migrate-hustoj/script.ts
+++ b/packages/migrate-hustoj/script.ts
@@ -2,6 +2,7 @@
 /* eslint-disable no-await-in-loop */
 import mysql from 'mysql';
 import 'hydrooj';
+import { buildContent } from 'hydrooj/dist/utils';
 
 const {
     user, problem, builtin: { PRIV },
@@ -79,20 +80,32 @@ export async function run({
         submit	int	11	Y	总提交次数
         solved	int	11	Y	解答（未用）
     */
-    const [pdocs] = await query('SELECT * FROM `problem`');
-    for (const pdoc of pdocs) {
-        const pid = await problem.add(
-            'system', `P${pdoc.problem_id}`,
-            pdoc.title, pdoc.description + pdoc.input + pdoc.output + pdoc.sample_input + pdoc.sample_output + pdoc.hint,
-            1, pdoc.source.split(' '), undefined, undefined, pdoc.defunct === 'Y',
-        );
-        const [cdoc] = await query(`SELECT * FROM 'privilege' WHERE rightstr = 'p${pdoc.problem_id}'`);
-        await problem.edit('system', pid, {
-            nAccept: pdoc.accepted,
-            nSubmit: pdoc.submit,
-            config: { time: `${pdoc.time_limit}s`, memory: `${pdoc.memory_limit}m` },
-            owner: uidMap[cdoc[0].user_id],
-        });
+    const [[pcount]] = await query('SELECT count(*) FROM `problem`');
+    const step = 50;
+    const pageCount = Math.ceil(pcount / step);
+    for (let pageId = 0; pageId < pageCount; pageId++) {
+        const [pdocs] = await query(`SELECT * FROM \`problem\` LIMIT ${pageId * step}, ${step}`);
+        for (const pdoc of pdocs) {
+            const pid = await problem.add(
+                'system', `P${pdoc.problem_id}`,
+                pdoc.title, buildContent({
+                    description: pdoc.description,
+                    input: pdoc.input,
+                    output: pdoc.output,
+                    samples: [[pdoc.sample_input, pdoc.sample_output]],
+                    hint: pdoc.hint,
+                    source: pdoc.source,
+                }, 'html'),
+                1, pdoc.source.split(' '), undefined, undefined, pdoc.defunct === 'Y',
+            );
+            const [cdoc] = await query(`SELECT * FROM 'privilege' WHERE rightstr = 'p${pdoc.problem_id}'`);
+            await problem.edit('system', pid, {
+                nAccept: pdoc.accepted,
+                nSubmit: pdoc.submit,
+                config: { time: `${pdoc.time_limit}s`, memory: `${pdoc.memory_limit}m` },
+                owner: uidMap[cdoc[0].user_id],
+            });
+        }
     }
     return true;
 }