diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index da6d501cc..8f9f3dd2f 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -581,6 +581,15 @@ export class ProblemCreateHandler extends Handler {
     }
 }
 
+export class ProblemPrefixListHandler extends Handler {
+    @param('prefix', Types.Name)
+    async get(domainId: string, prefix: string) {
+        this.response.body = {
+            pdocs: await problem.getPrefixList(domainId, prefix),
+        };
+    }
+}
+
 export async function apply() {
     Route('problem_main', '/p', ProblemMainHandler, PERM.PERM_VIEW_PROBLEM);
     Route('problem_category', '/p/category/:category', ProblemCategoryHandler, PERM.PERM_VIEW_PROBLEM);
@@ -596,6 +605,7 @@ export async function apply() {
     Route('problem_solution_raw', '/p/:pid/solution/:psid/raw', ProblemSolutionRawHandler, PERM.PERM_VIEW_PROBLEM);
     Route('problem_solution_reply_raw', '/p/:pid/solution/:psid/:psrid/raw', ProblemSolutionRawHandler, PERM.PERM_VIEW_PROBLEM);
     Route('problem_create', '/problem/create', ProblemCreateHandler, PERM.PERM_CREATE_PROBLEM);
+    Route('problem_prefix_list', '/problem/list', ProblemPrefixListHandler, PERM.PERM_VIEW_PROBLEM);
     Connection('problem_pretest_conn', '/conn/pretest', ProblemPretestConnectionHandler, PERM.PERM_SUBMIT_PROBLEM);
 }
 
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index 0645752c2..27e630c07 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -1,6 +1,6 @@
 import type { Readable } from 'stream';
 import { ObjectID, FilterQuery } from 'mongodb';
-import { Dictionary, pick } from 'lodash';
+import { Dictionary, escapeRegExp, pick } from 'lodash';
 import { STATUS } from './builtin';
 import * as document from './document';
 import domain from './domain';
@@ -208,6 +208,13 @@ export class ProblemModel {
         return Object.assign(r, l);
     }
 
+    static async getPrefixList(domainId: string, prefix: string) {
+        prefix = prefix.toLowerCase();
+        const $regex = new RegExp(`\\A${escapeRegExp(prefix)}`, 'gmi');
+        const filter = { $or: [{ pid: { $regex } }, { title: { $regex } }] };
+        return await document.getMulti(domainId, document.TYPE_PROBLEM, filter, ['domainId', 'docId', 'pid', 'title']).toArray();
+    }
+
     static async getListStatus(domainId: string, uid: number, pids: number[]) {
         const psdocs = await ProblemModel.getMultiStatus(
             domainId, { uid, docId: { $in: Array.from(new Set(pids)) } },
diff --git a/packages/hydrooj/src/model/user.ts b/packages/hydrooj/src/model/user.ts
index 407a2cc72..75373d6a0 100644
--- a/packages/hydrooj/src/model/user.ts
+++ b/packages/hydrooj/src/model/user.ts
@@ -1,4 +1,5 @@
 import { Collection } from 'mongodb';
+import { escapeRegExp } from 'lodash';
 import * as system from './system';
 import token from './token';
 import * as setting from './setting';
@@ -224,7 +225,7 @@ class UserModel {
     @ArgMethod
     static async getPrefixList(domainId: string, prefix: string, limit: number = 50) {
         prefix = prefix.toLowerCase();
-        const $regex = new RegExp(`\\A\\Q${prefix}\\E`, 'gmi');
+        const $regex = new RegExp(`\\A${escapeRegExp(prefix)}`, 'gmi');
         const uids = await coll.find({ unameLower: { $regex } })
             .limit(limit).map((doc) => doc._id).toArray();
         const users = [];
diff --git a/packages/hydrooj/test/db.ts b/packages/hydrooj/test/db.ts
index 9812e8c99..cb58498c7 100644
--- a/packages/hydrooj/test/db.ts
+++ b/packages/hydrooj/test/db.ts
@@ -11,7 +11,7 @@ export async function connect() {
     while (dbVer < expected) {
         const func = scripts[dbVer];
         dbVer++;
-        if (func.toString().includes('_FRESH_INSTALL_IGNORE')) continue;
+        if (typeof func !== 'function' || func.toString().includes('_FRESH_INSTALL_IGNORE')) continue;
         // eslint-disable-next-line no-await-in-loop
         await func();
     }
diff --git a/packages/ui-default/components/autocomplete/ProblemSelectAutoComplete.js b/packages/ui-default/components/autocomplete/ProblemSelectAutoComplete.js
new file mode 100644
index 000000000..1eb3c194a
--- /dev/null
+++ b/packages/ui-default/components/autocomplete/ProblemSelectAutoComplete.js
@@ -0,0 +1,41 @@
+import _ from 'lodash';
+import tpl from 'vj/utils/tpl';
+import request from 'vj/utils/request';
+import DOMAttachedObject from 'vj/components/DOMAttachedObject';
+import AutoComplete from '.';
+
+function getText(pdoc) {
+    return pdoc.docId;
+}
+
+function getItems(val) {
+    return request.get('/problem/list', { q: val });
+}
+
+function renderItem(pdoc) {
+    return tpl`
+    <div class="media">
+      <div class="media__body medium">
+        <div class="problem-select__name">${pdoc.pid ? `${pdoc.pid}` : ''}${pdoc.title}</div>
+        <div class="problem-select__id">ID = ${pdoc.docId}</div>
+      </div>
+    </div>
+  `;
+}
+
+export default class ProblemSelectAutoComplete extends AutoComplete {
+    static DOMAttachKey = 'vjProblemSelectAutoCompleteInstance';
+
+    constructor($dom, options) {
+        super($dom, {
+            classes: 'problem-select',
+            items: getItems,
+            render: renderItem,
+            text: getText,
+            ...options,
+        });
+    }
+}
+
+_.assign(ProblemSelectAutoComplete, DOMAttachedObject);
+window.Hydro.components.UserSelectAutoComplete = ProblemSelectAutoComplete;
diff --git a/packages/ui-default/components/autocomplete/autoComplete.page.js b/packages/ui-default/components/autocomplete/autoComplete.page.js
new file mode 100644
index 000000000..5183d43fc
--- /dev/null
+++ b/packages/ui-default/components/autocomplete/autoComplete.page.js
@@ -0,0 +1,12 @@
+import { AutoloadPage } from 'vj/misc/Page';
+import UserSelectAutoComplete from './UserSelectAutoComplete';
+import DomainSelectAutoComplete from './DomainSelectAutoComplete';
+import ProblemSelectAutoComplete from './ProblemSelectAutoComplete';
+
+const page = new AutoloadPage('autocomplete', () => {
+    UserSelectAutoComplete.getOrConstruct($('[autocomplete="user"]'));
+    DomainSelectAutoComplete.getOrConstruct($('[autocomplete="domain"]'));
+    ProblemSelectAutoComplete.getOrConstruct($('[autocomplete="problem"]'));
+});
+
+export default page;
diff --git a/packages/ui-default/components/autocomplete/problemselectautocomplete.page.styl b/packages/ui-default/components/autocomplete/problemselectautocomplete.page.styl
new file mode 100644
index 000000000..d7910b617
--- /dev/null
+++ b/packages/ui-default/components/autocomplete/problemselectautocomplete.page.styl
@@ -0,0 +1,6 @@
+.menu.problem-select
+  width: rem(200px)
+
+.problem-select__uid
+  font-size: rem($font-size-small)
+  color: $userselect-uid-color