diff --git a/packages/hydrooj/src/handler/contest.ts b/packages/hydrooj/src/handler/contest.ts
index 5d77ebf3b..b2ff40d61 100644
--- a/packages/hydrooj/src/handler/contest.ts
+++ b/packages/hydrooj/src/handler/contest.ts
@@ -73,32 +73,37 @@ ScheduleModel.Worker.addHandler('contest', async (doc) => {
 
 export class ContestListHandler extends Handler {
     @param('rule', Types.Range(contest.RULES), true)
+    @param('group', Types.Name, true)
     @param('page', Types.PositiveInt, true)
-    async get(domainId: string, rule = '', page = 1) {
+    async get(domainId: string, rule = '', group = '', page = 1) {
         if (rule && contest.RULES[rule].hidden) throw new BadRequestError();
+        const groups = (await user.listGroup(domainId, this.user._id)).map((i) => i.name);
+        if (group && !groups.includes(group)) throw new NotAssignedError(group);
         const rules = Object.keys(contest.RULES).filter((i) => !contest.RULES[i].hidden);
         const q = {
-            ...this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_CONTEST)
+            ...this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_CONTEST) && !group
                 ? {}
                 : {
                     $or: [
                         { maintainer: this.user._id },
                         { owner: this.user._id },
-                        { assign: { $in: this.user.group } },
+                        { assign: { $in: groups } },
                         { assign: { $size: 0 } },
                     ],
                 },
             ...rule ? { rule } : { rule: { $in: rules } },
+            ...group ? { assign: { $in: [group] } } : {},
         };
         const cursor = contest.getMulti(domainId, q);
-        const qs = rule ? `rule=${rule}` : '';
+        let qs = rule ? `rule=${rule}` : '';
+        if (group) qs += qs ? `&group=${group}` : `group=${group}`;
         const [tdocs, tpcount] = await paginate<Tdoc>(cursor, page, system.get('pagination.contest'));
         const tids = [];
         for (const tdoc of tdocs) tids.push(tdoc.docId);
         const tsdict = await contest.getListStatus(domainId, this.user._id, tids);
         this.response.template = 'contest_main.html';
         this.response.body = {
-            page, tpcount, qs, rule, tdocs, tsdict,
+            page, tpcount, qs, rule, tdocs, tsdict, groups, group,
         };
     }
 }
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index 6a3ac7c42..ca767dba9 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -21,20 +21,24 @@ const validatePenaltyRules = (input: string) => yaml.load(input);
 const convertPenaltyRules = validatePenaltyRules;
 
 class HomeworkMainHandler extends Handler {
+    @param('group', Types.Name, true)
     @param('page', Types.PositiveInt, true)
-    async get(domainId: string, page = 1) {
+    async get(domainId: string, group = '', page = 1) {
+        const groups = (await user.listGroup(domainId, this.user._id)).map((i) => i.name);
+        if (group && !groups.includes(group)) throw new NotAssignedError(group);
         const cursor = contest.getMulti(domainId, {
             rule: 'homework',
-            ...this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_HOMEWORK)
+            ...this.user.hasPerm(PERM.PERM_VIEW_HIDDEN_HOMEWORK) && !group
                 ? {}
                 : {
                     $or: [
                         { maintainer: this.user._id },
                         { owner: this.user._id },
-                        { assign: { $in: this.user.group } },
+                        { assign: { $in: groups } },
                         { assign: { $size: 0 } },
                     ],
                 },
+            ...group ? { assign: { $in: [group] } } : {},
         });
         const [tdocs, tpcount] = await paginate<Tdoc>(cursor, page, system.get('pagination.contest'));
         const calendar = [];
@@ -46,8 +50,9 @@ class HomeworkMainHandler extends Handler {
             } else cal.endAt = tdoc.penaltySince;
             calendar.push(cal);
         }
+        const qs = group ? `group=${group}` : '';
         this.response.body = {
-            tdocs, calendar, tpcount, page,
+            tdocs, calendar, tpcount, page, qs, groups, group,
         };
         this.response.template = 'homework_main.html';
     }
diff --git a/packages/ui-default/pages/homework_main.page.styl b/packages/ui-default/pages/homework_main.page.styl
index fd6bd952e..8482c6c30 100644
--- a/packages/ui-default/pages/homework_main.page.styl
+++ b/packages/ui-default/pages/homework_main.page.styl
@@ -11,4 +11,7 @@ $highlight-button-color = #F6DF45
 
   .homework__date
     margin-right: rem(10px)
-    white-space: nowrap
\ No newline at end of file
+    white-space: nowrap
+  
+  .filter-form
+    display: inline-block
\ No newline at end of file
diff --git a/packages/ui-default/templates/contest_main.html b/packages/ui-default/templates/contest_main.html
index c2d0597a0..331d14df9 100644
--- a/packages/ui-default/templates/contest_main.html
+++ b/packages/ui-default/templates/contest_main.html
@@ -60,10 +60,18 @@
         <div class="section__tools">
           <form method="get" name="filter-form">
             {{ _('Show') }}:
+          {% if groups.length %}
+            <select class="inline compact select" name="group">
+              <option value=""{% if not group %} selected{% endif %}>{{ _('All') }}</option>
+              {%- for g in groups -%}
+                  <option value="{{ g }}"{% if group == g %} selected{% endif %}>{{ g }}</option>
+              {%- endfor -%}
+            </select>
+          {% endif %}
             <select class="inline compact select" name="rule">
               <option value=""{% if not rule %} selected{% endif %}>{{ _('All') }}</option>
               {%- for k, v in model.contest.RULES -%}
-                {% if k != 'homework' %}
+                {% if not k.hidden %}
                   <option value="{{ k }}"{% if rule == k %} selected{% endif %}>{{ _('All {0} Contests').format(v.TEXT) }}</option>
                 {% endif %}
               {%- endfor -%}
diff --git a/packages/ui-default/templates/homework_main.html b/packages/ui-default/templates/homework_main.html
index a12b2ecf2..9d8c0a90e 100644
--- a/packages/ui-default/templates/homework_main.html
+++ b/packages/ui-default/templates/homework_main.html
@@ -14,6 +14,20 @@
               <option value="list" selected>{{ _('List View') }}</option>
             </select>
           </span>
+        {% if groups.length %}
+          <form method="get" class="filter-form" name="filter-form">
+            {{ _('Show') }}:
+            <select class="inline compact select" name="group">
+              <option value=""{% if not group %} selected{% endif %}>{{ _('All') }}</option>
+              {%- for g in groups -%}
+                  <option value="{{ g }}"{% if group == g %} selected{% endif %}>{{ g }}</option>
+              {%- endfor -%}
+            </select>
+            <button type="submit" class="compact button hasjs--hide">
+              {{ _('Search') }}
+            </button>
+          </form>
+        {% endif %}
         {% if handler.user.hasPerm(perm.PERM_CREATE_HOMEWORK) %}
           <a class="compact button" href="{{ url('homework_create') }}">{{ _('Create Homework') }}</a>
         {% endif %}
@@ -51,7 +65,7 @@
           </li>
         {%- endfor -%}
         </ol>
-        {{ paginator.render(page, tpcount) }}
+        {{ paginator.render(page, tpcount, add_qs=qs) }}
         <div name="calendar_entry"></div>
       {% endif %}
       </div>