diff --git a/openslides/core/migrations/0007_manage_chat_permission.py b/openslides/core/migrations/0007_manage_chat_permission.py
new file mode 100644
index 000000000..704fd4db1
--- /dev/null
+++ b/openslides/core/migrations/0007_manage_chat_permission.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.1 on 2016-10-17 09:50
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0006_multiprojector'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='chatmessage',
+            options={'default_permissions': (), 'permissions': (('can_use_chat', 'Can use the chat'), ('can_manage_chat', 'Can manage the chat'))},
+        ),
+    ]
diff --git a/openslides/core/models.py b/openslides/core/models.py
index cffa04d76..583071f35 100644
--- a/openslides/core/models.py
+++ b/openslides/core/models.py
@@ -287,7 +287,8 @@ class ChatMessage(RESTModelMixin, models.Model):
     class Meta:
         default_permissions = ()
         permissions = (
-            ('can_use_chat', 'Can use the chat'),)
+            ('can_use_chat', 'Can use the chat'),
+            ('can_manage_chat', 'Can manage the chat'),)
 
     def __str__(self):
         return 'Message {}'.format(self.timestamp)
diff --git a/openslides/core/static/css/app.css b/openslides/core/static/css/app.css
index 02ce19333..92dbc1504 100644
--- a/openslides/core/static/css/app.css
+++ b/openslides/core/static/css/app.css
@@ -1223,7 +1223,7 @@ img {
     border-color: #dddddd;
     border-width: 1px;
     box-shadow: -5px 5px 5px rgba(0, 0, 0, 0.2);
-    height: 200px;
+    height: 234px;
     padding: 0 10px 10px 10px;
     z-index: 5;
 }
diff --git a/openslides/core/static/js/core/site.js b/openslides/core/static/js/core/site.js
index ea3c85529..c66b9ed41 100644
--- a/openslides/core/static/js/core/site.js
+++ b/openslides/core/static/js/core/site.js
@@ -1296,6 +1296,10 @@ angular.module('OpenSlidesApp.core.site', [
                 }
             }
         });
+
+        $scope.clearChatHistory = function () {
+            console.log("Clear");
+        };
     }
 ])
 
diff --git a/openslides/core/static/templates/index.html b/openslides/core/static/templates/index.html
index 9a4939fd6..2a58195da 100644
--- a/openslides/core/static/templates/index.html
+++ b/openslides/core/static/templates/index.html
@@ -63,6 +63,12 @@
                       <button type="submit" class="btn btn-default" id="messageSendButton">
                         <i class="fa fa-comment"></i>
                       </button>
+                      <button os-perms="core.can_manage_chat" type="button"
+                        class="btn btn-default btn-danger" id="clearchatHistory"
+                        ng-bootbox-confirm="{{ 'Are you sure to delete the chat history?' | translate }}"
+                        ng-bootbox-confirm-action="clearChatHistory()">
+                        <i class="fa fa-trash"></i>
+                      </button>
                     </span>
                   </div>
                 </form>
diff --git a/openslides/users/signals.py b/openslides/users/signals.py
index d2d4eb58c..c546f9daa 100644
--- a/openslides/users/signals.py
+++ b/openslides/users/signals.py
@@ -27,6 +27,7 @@ def create_builtin_groups_and_admin(**kwargs):
         'core.can_manage_config',
         'core.can_manage_projector',
         'core.can_manage_tags',
+        'core.can_manage_chat',
         'core.can_see_frontpage',
         'core.can_see_projector',
         'core.can_use_chat',
@@ -102,6 +103,7 @@ def create_builtin_groups_and_admin(**kwargs):
         permission_dict['core.can_manage_projector'],
         permission_dict['core.can_manage_tags'],
         permission_dict['core.can_use_chat'],
+        permission_dict['core.can_manage_chat'],
         permission_dict['mediafiles.can_see'],
         permission_dict['mediafiles.can_manage'],
         permission_dict['mediafiles.can_upload'],