diff --git a/app/forms/contribution_form.rb b/app/forms/contribution_form.rb
index c3365a4..cf00120 100644
--- a/app/forms/contribution_form.rb
+++ b/app/forms/contribution_form.rb
@@ -17,6 +17,7 @@ class ContributionForm
     greater_than_or_equal_to: 0
   }
   validate :not_over_remain_amount
+  validate :no_less_than_equal_zero_amount
 
   def fund
     @fund = Fund.find(fund_id)
@@ -55,4 +56,10 @@ def not_over_remain_amount
       errors.add(:amount, "최대 참여 가능 금액을 초과하였습니다.")
     end
   end
+
+  def no_less_than_equal_zero_amount
+    if amount.present? and amount <= 0
+      errors.add(:amount, "0원 이하로 낼 수 없습니다.")
+    end
+  end
 end
\ No newline at end of file
diff --git a/app/models/contribution.rb b/app/models/contribution.rb
index 7a96796..5798594 100644
--- a/app/models/contribution.rb
+++ b/app/models/contribution.rb
@@ -1,4 +1,10 @@
 class Contribution < ActiveRecord::Base
   belongs_to :user
   belongs_to :fund
+
+  scope :approved, -> { where(approved: true) }
+
+  def approve!
+    update_attributes!(approved: true)
+  end
 end
diff --git a/app/models/fund.rb b/app/models/fund.rb
index 02b0032..ff35587 100644
--- a/app/models/fund.rb
+++ b/app/models/fund.rb
@@ -4,8 +4,12 @@ class Fund < ActiveRecord::Base
   belongs_to :friend
   has_many :contributions
 
+  def complete?
+    remain_amount <= 0
+  end
+
   def total_amount
-    @total_amount ||= self.contributions.pluck(:amount).reduce(0, :+)
+    @total_amount ||= self.contributions.approved.pluck(:amount).reduce(0, :+)
   end
 
   def remain_amount
diff --git a/app/views/funds/show.html.erb b/app/views/funds/show.html.erb
index 11c8a11..f5cf59b 100644
--- a/app/views/funds/show.html.erb
+++ b/app/views/funds/show.html.erb
@@ -44,7 +44,11 @@
       </div>
       <div class="friend-information">
         <div class="contribute-button">
-          <%= link_to "#{@fund.friend.name} 에게 선물하기", new_fund_contribution_path(@fund), class: 'btn btn-lg btn-success btn-block pull-right'%>
+          <% if @fund.complete? %>
+            <%= link_to "모금 완료!", new_fund_contribution_path(@fund), class: 'btn btn-lg btn-success btn-block pull-right', disabled: true %>
+          <% else %>
+            <%= link_to "#{@fund.friend.name} 에게 선물하기", new_fund_contribution_path(@fund), class: 'btn btn-lg btn-success btn-block pull-right' %>
+          <% end %>
         </div>
       </div>
       <div class="friend-information">
diff --git a/db/migrate/20150317023139_add_approved_to_contribution.rb b/db/migrate/20150317023139_add_approved_to_contribution.rb
new file mode 100644
index 0000000..a63b1c6
--- /dev/null
+++ b/db/migrate/20150317023139_add_approved_to_contribution.rb
@@ -0,0 +1,5 @@
+class AddApprovedToContribution < ActiveRecord::Migration
+  def change
+    add_column :contributions, :approved, :boolean, default: false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index efce4c8..cedecb1 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,16 +11,17 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150314144532) do
+ActiveRecord::Schema.define(version: 20150317023139) do
 
   create_table "contributions", force: :cascade do |t|
     t.integer  "user_id"
     t.integer  "fund_id"
     t.integer  "amount"
     t.text     "message"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime "created_at",                 null: false
+    t.datetime "updated_at",                 null: false
     t.string   "payment"
+    t.boolean  "approved",   default: false
   end
 
   create_table "friends", force: :cascade do |t|