diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 92ed38297..7b70caac7 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -148,7 +148,7 @@ export class ProblemMainHandler extends Handler {
         let sort: string[];
         let fail = false;
         let pcountRelation = 'eq';
-        const category = flattenDeep(decodeURIComponent(q).split(' ')
+        const category = flattenDeep(q.split(' ')
             .filter((i) => i.startsWith('category:'))
             .map((i) => i.split('category:')[1]?.split(',')));
         const text = q.split(' ').filter((i) => !i.startsWith('category:')).join(' ');
@@ -294,7 +294,7 @@ export class ProblemMainHandler extends Handler {
 export class ProblemRandomHandler extends Handler {
     @param('q', Types.Content, true)
     async get(domainId: string, qs = '') {
-        const category = flattenDeep(decodeURIComponent(qs).split(' ')
+        const category = flattenDeep(qs.split(' ')
             .filter((i) => i.startsWith('category:'))
             .map((i) => i.split('category:')[1]?.split(',')));
         const q = buildQuery(this.user);
diff --git a/packages/ui-default/components/omnisearch/index.page.tsx b/packages/ui-default/components/omnisearch/index.page.tsx
index 64c10b982..cbcf74e5b 100644
--- a/packages/ui-default/components/omnisearch/index.page.tsx
+++ b/packages/ui-default/components/omnisearch/index.page.tsx
@@ -90,7 +90,7 @@ export default new AutoloadPage('omnibar', () => {
     }
     setSearching?.(true);
     [{ pdocs, psdict }, udocs] = await Promise.all([
-      request.get(`/d/${UiContext.domainId}/p?q=${encodeURIComponent(query)}&limit=10`),
+      request.get(`/d/${UiContext.domainId}/p`, { q: query, limit: 10 }),
       api(gql`
         users(search: ${query}) {
           _id