diff --git a/app/controllers/desktop/co_authors_controller.rb b/app/controllers/desktop/co_authors_controller.rb
new file mode 100644
index 00000000..6c4d980a
--- /dev/null
+++ b/app/controllers/desktop/co_authors_controller.rb
@@ -0,0 +1,71 @@
+class Desktop::CoAuthorsController < ApplicationController
+  def index
+    @co_authors = CoAuthor.where(name_id: current_user.id)
+
+    respond_to do |format|
+      format.html { render :layout => false}
+      format.json { render json: @co_authors }
+    end
+  end
+
+  def show
+    @co_author = CoAuthor.find(params[:id])
+
+    respond_to do |format|
+      format.html { redirect_to desktop_co_authors_url, :layout => false }
+      format.json { render json: @co_author }
+    end
+  end
+
+  def new
+    @co_author = CoAuthor.new
+
+    respond_to do |format|
+      format.html { render :layout => false}
+    end
+  end
+
+  def edit
+    @co_author = CoAuthor.find(params[:id])
+    respond_to do |format|
+      format.html { render :layout => false}
+    end
+  end
+
+  def create
+    @co_author = CoAuthor.new(params[:co_author])
+    @co_author.name_id= current_user.id
+
+    respond_to do |format|
+      if @co_author.save
+        format.html { redirect_to desktop_co_authors_path, :layout => false, notice: 'CoAuthor was successfully created.' }
+      else
+        format.html { render action: "new", :layout => false}
+      end
+    end
+  end
+
+  def update
+    @co_author = CoAuthor.find(params[:id])
+
+      respond_to do |format|
+        if @co_author.update_attributes(params[:co_author])
+          format.html { redirect_to desktop_co_authors_url, notice: 'CoAuthor was successfully updated.' }
+          format.json { head :no_content }
+        else
+          format.html { render action: "edit" }
+          format.json { render json: @co_author.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  def delete
+    @co_author = CoAuthor.find(params[:id])
+    @co_author.destroy
+
+    respond_to do |format|
+      format.html { redirect_to desktop_co_authors_url, :layout => false }
+      format.json { head :no_content }
+    end
+  end
+end
diff --git a/app/models/user/co_author.rb b/app/models/user/co_author.rb
new file mode 100644
index 00000000..ab7c75a5
--- /dev/null
+++ b/app/models/user/co_author.rb
@@ -0,0 +1,19 @@
+class CoAuthor
+  include Mongoid::Document
+
+  LANGUAGE_TYPES = [ "English", "Chinese" ]
+
+  field :name_id, type: BSON::ObjectId
+  field :co_author, localize: true
+  field :email
+  field :type
+
+
+  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
+  validates :email, format: { with: VALID_EMAIL_REGEX },
+             uniqueness: { case_sensitive: false }
+
+  validates :co_author, presence: true
+  before_save { |coauthor| coauthor.email = email.downcase }
+end
+
diff --git a/app/views/desktop/co_authors/_form.html.erb b/app/views/desktop/co_authors/_form.html.erb
new file mode 100644
index 00000000..22b8433e
--- /dev/null
+++ b/app/views/desktop/co_authors/_form.html.erb
@@ -0,0 +1,44 @@
+<% if @co_author.errors.any? %>
+  <div id="error_explanation">
+    <h2><%= pluralize(@co_author.errors.count, "error") %> prohibited this user from being saved:</h2>
+    <ul>
+      <% @co_author.errors.full_messages.each do |msg| %>
+        <li><%= msg %></li>
+      <% end %>
+    </ul>
+  </div>
+<% end %>
+<div class="fn_g hp">
+
+  <%= button_tag "Save", name: "commit", value: "Save", class: "fn_btn hh2 thmc2 thmtxt" %>
+  <%= button_tag "Cancel", name: "commit", value: "Cancel", class: "fn_btn hh2 thmc2 thmtxt" %>
+</div>
+
+<div></div>
+<ul>
+  <li class="s_grid_row">
+  <%= f.label :co_author %><br />
+  <%= f.text_field :co_author %>
+  </li>
+
+  <li class="s_grid_row">
+  <%= f.label :email %><br />
+  <%= f.text_field :email %>
+  </li>
+
+  <li class="s_grid_row">
+  <%= f.label :type%><br />
+  <select name="co_author[type]" id="" class="s_grid s_grid_4">
+    <%= options_for_select(
+      [["朋友","朋友"],
+       ["學生","摯友"],
+       ["老師","老師"],
+       ["摯友","摯友"],
+       ["親戚","親戚"],
+       ["同事","同事"],
+       ["共同作者","共同作者"]
+    ])
+  %>
+  </select>
+  </li>
+</ul>
diff --git a/app/views/desktop/co_authors/edit.html.erb b/app/views/desktop/co_authors/edit.html.erb
new file mode 100644
index 00000000..2f48f4c5
--- /dev/null
+++ b/app/views/desktop/co_authors/edit.html.erb
@@ -0,0 +1,3 @@
+<%= form_for @co_author, url: desktop_co_author_path(@co_author) do |f| %>
+  <%= render partial: 'desktop/co_authors/form', locals: {:f => f} %>
+<% end %>
diff --git a/app/views/desktop/co_authors/index.html.erb b/app/views/desktop/co_authors/index.html.erb
new file mode 100644
index 00000000..147552d2
--- /dev/null
+++ b/app/views/desktop/co_authors/index.html.erb
@@ -0,0 +1,20 @@
+<table>
+  <tr>
+    <th>Name</th>
+    <th>EMail</th>
+    <th>Type</th>
+    <th></th>
+    <th></th>
+    <th></th>
+  </tr>
+
+<% @co_authors.each do |co_author| %>
+  <tr>
+    <td><%= co_author.co_author %></td>
+    <td><%= co_author.email %></td>
+    <td><%= co_author.type%></td>
+    <td><%= link_to 'Destroy', desktop_co_author_path(co_author), method: :delete, confirm: 'Are you sure?'  %></td>
+  </tr>
+<% end %>
+</table>
+<br />
diff --git a/app/views/desktop/co_authors/new.html.erb b/app/views/desktop/co_authors/new.html.erb
new file mode 100644
index 00000000..5c6fab16
--- /dev/null
+++ b/app/views/desktop/co_authors/new.html.erb
@@ -0,0 +1,3 @@
+<%= form_for @co_author, url: desktop_co_authors_path do |f| %>
+  <%= render partial: 'desktop/co_authors/form', locals: {:f => f} %>
+<% end %>
diff --git a/app/views/desktop/co_authors/show.html.erb b/app/views/desktop/co_authors/show.html.erb
new file mode 100644
index 00000000..e69de29b