diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -111,6 +111,6 @@
   private
 
     def announcement_params
-      params.require(:announcement).permit(:author, :body, :published, :frontpage, :contest_only, :title)
+      params.require(:announcement).permit(:author, :body, :published, :frontpage, :contest_only, :title, :on_nav_bar)
     end
 end
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -4,6 +4,7 @@
   protect_from_forgery
 
   before_action :current_user
+  before_action :nav_announcement
 
   SINGLE_USER_MODE_CONF_KEY = 'system.single_user_mode'
   MULTIPLE_IP_LOGIN_CONF_KEY = 'right.multiple_ip_login'
@@ -22,6 +23,10 @@
     @current_user ||= User.find(session[:user_id])
   end
 
+  def nav_announcement
+    @nav_announcement = Announcement.where(on_nav_bar: true)
+  end
+
   def admin_authorization
     return false unless check_valid_login
     user = User.includes(:roles).find(session[:user_id])
diff --git a/app/views/announcements/_form.html.haml b/app/views/announcements/_form.html.haml
new file mode 100644
--- /dev/null
+++ b/app/views/announcements/_form.html.haml
@@ -0,0 +1,25 @@
+= simple_form_for(@announcement) do |f|
+  - if @announcement.errors.any?
+    .form-row
+      .col-sm-12
+        #error_explanation.alert.alert-dismissable.alert-danger
+          %button.close{type: "button", data: { dismiss: "alert"}, aria: {hidden: "true"}} ×
+          %h3= "เกิดปัญหาในการบันทึกข้อมูลเนื่องจาก"
+          %ul
+            - @announcement.errors.full_messages.each do |message|
+              %li= message
+  .form-row
+    .col-md-6.col-12
+      -# = f.input :lock_version, as: :hidden
+      = f.input :title
+      = f.input :notes, label: 'Notes (shown internally, used to organize announcements)'
+      = f.input :body
+      = f.input :author
+      = f.input :published
+      = f.input :frontpage, label: 'Display in the front page only?'
+      = f.input :on_nav_bar, label: 'Show on menu bar?', wrapper: :custom_boolean
+      = f.input :contest_only, label: 'Display in contest only?'
+      = f.submit "Create", class: 'btn btn-primary'
+      -if content_for?(:form_buttons)
+        = yield(:form_buttons)
+        / = link_to 'Back', announcements_path, class: 'btn btn-default'
diff --git a/app/views/announcements/edit.html.haml b/app/views/announcements/edit.html.haml
--- a/app/views/announcements/edit.html.haml
+++ b/app/views/announcements/edit.html.haml
@@ -1,34 +1,45 @@
-.container-fluid
-  %h1 Editing announcement
-  = error_messages_for :announcement
-  .row
-    .col-md-6
-      = form_for(@announcement) do |f|
-        .form-group
-          %label Title
-          = f.text_field :title, class: 'form-control'
-        .form-group
-          %label Notes
-          (shown internally, used to organize announcements)
-          = f.text_field :notes, class: 'form-control'
-        .form-group
-          %label Body
-          = f.text_area  :body, class: 'form-control', style: 'height: 200px;'
-        .form-group
-          %label Author
-          = f.text_field :author, class: 'form-control'
-        .checkbox
-          %label 
-            = f.check_box :published
-            Published
-        .checkbox
-          %label 
-            = f.check_box :frontpage
-            Show on front page?
-        .checkbox
-          %label 
-            = f.check_box :contest_only
-            Show only in contest?
-        = f.submit "Update", class: 'btn btn-primary'
-        = link_to 'Show', @announcement, class: 'btn btn-default'
-        = link_to 'Back', announcements_path, class: 'btn btn-default'
+%h1 Edit Announcement
+
+-content_for(:form_buttons) do
+  = link_to t(:back), announcements_path, class: 'card-link btn btn-secondary'
+
+= render 'form'
+-# old style
+  .container-fluid
+    %h1 Editing announcement
+    = error_messages_for :announcement
+    .row
+      .col-md-6
+        = form_for(@announcement) do |f|
+          .form-group
+            %label Title
+            = f.text_field :title, class: 'form-control'
+          .form-group
+            %label Notes
+            (shown internally, used to organize announcements)
+            = f.text_field :notes, class: 'form-control'
+          .form-group
+            %label Body
+            = f.text_area  :body, class: 'form-control', style: 'height: 200px;'
+          .form-group
+            %label Author
+            = f.text_field :author, class: 'form-control'
+          .checkbox
+            %label 
+              = f.check_box :published
+              Published
+          .checkbox
+            %label 
+              = f.check_box :frontpage
+              Show on front page?
+          .checkbox
+            %label 
+              = f.check_box :on_nav_bar
+              Show on top menu bar?
+          .checkbox
+            %label 
+              = f.check_box :contest_only
+              Show only in contest?
+          = f.submit "Update", class: 'btn btn-primary'
+          = link_to 'Show', @announcement, class: 'btn btn-default'
+          = link_to 'Back', announcements_path, class: 'btn btn-default'
diff --git a/app/views/announcements/new.html.haml b/app/views/announcements/new.html.haml
--- a/app/views/announcements/new.html.haml
+++ b/app/views/announcements/new.html.haml
@@ -1,14 +1,22 @@
 %h1 New announcement
-= error_messages_for :announcement
-= simple_form_for(@announcement) do |f|
-  .row
-    .col-md-6
-      = f.input :title
-      = f.input :notes, label: 'Notes (shown internally, used to organize announcements)'
-      = f.input :body
-      = f.input :author
-      = f.input :published
-      = f.input :frontpage, label: 'Display in the front page only?'
-      = f.input :contest_only, label: 'Display in contest only?'
-      = f.button :submit, "Create", class: 'btn btn-primary'
-      = link_to 'Back', announcements_path, class: 'btn btn-default'
+
+-content_for(:form_buttons) do
+  = link_to t(:back), announcements_path, class: 'card-link btn btn-secondary'
+
+= render 'form'
+
+-# old style
+  = error_messages_for :announcement
+  = simple_form_for(@announcement) do |f|
+    .row
+      .col-md-6
+        = f.input :title
+        = f.input :notes, label: 'Notes (shown internally, used to organize announcements)'
+        = f.input :body
+        = f.input :author
+        = f.input :published
+        = f.input :frontpage, label: 'Display in the front page only?'
+        = f.input :contest_only, label: 'Display in contest only?'
+        = f.button :submit, "Create", class: 'btn btn-primary'
+        = link_to 'Back', announcements_path, class: 'btn btn-default'
+
diff --git a/app/views/announcements/show.html.haml b/app/views/announcements/show.html.haml
--- a/app/views/announcements/show.html.haml
+++ b/app/views/announcements/show.html.haml
@@ -17,6 +17,9 @@
   %b Show on front page:
   = h @announcement.frontpage
 %p
+  %b Show on top menu bar:
+  = h @announcement.on_nav_bar
+%p
   %b Show only in contest:
   = h @announcement.contest_only
 = link_to 'Edit', edit_announcement_path(@announcement)
diff --git a/app/views/layouts/_header.html.haml b/app/views/layouts/_header.html.haml
--- a/app/views/layouts/_header.html.haml
+++ b/app/views/layouts/_header.html.haml
@@ -70,6 +70,12 @@
               =link_to "#{ungraded} backlogs!",
                 graders_list_path,
                 class: 'navbar-btn btn btn-default btn-warning', data: {toggle: 'tooltip'},title: 'Number of ungraded submission'
+          / announcement
+          - @nav_announcement.each do |ann|
+            %p.navbar-text
+              = ann.body.html_safe
+
+            
 
         %ul.nav.navbar-nav.navbar-right
           = add_menu("#{content_tag(:span,'',class: 'glyphicon glyphicon-question-sign')}".html_safe, 'main', 'help')
diff --git a/db/migrate/20210124101028_add_on_nav_bar_to_announcement.rb b/db/migrate/20210124101028_add_on_nav_bar_to_announcement.rb
new file mode 100644
--- /dev/null
+++ b/db/migrate/20210124101028_add_on_nav_bar_to_announcement.rb
@@ -0,0 +1,5 @@
+class AddOnNavBarToAnnouncement < ActiveRecord::Migration[5.2]
+  def change
+    add_column :announcements, :on_nav_bar, :boolean, default: false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_08_13_083020) do
+ActiveRecord::Schema.define(version: 2021_01_24_101028) do
 
   create_table "announcements", id: :integer, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci", force: :cascade do |t|
     t.string "author"
@@ -22,6 +22,7 @@
     t.boolean "contest_only", default: false
     t.string "title"
     t.string "notes"
+    t.boolean "on_nav_bar", default: false
   end
 
   create_table "contests", id: :integer, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci", force: :cascade do |t|