diff --git a/app/models/user_score_details.rb b/app/models/user_score_details.rb
new file mode 100644
index 00000000..61d5d098
--- /dev/null
+++ b/app/models/user_score_details.rb
@@ -0,0 +1,4 @@
+class UserScoreDetails < ActiveRecord::Base
+  attr_accessible :current_user_id, :current_user_level, :new_score, :old_score, :score_action, :score_changeable_obj_id, :score_changeable_obj_type, :score_type, :target_user_id, :target_user_level, :user_id
+  belongs_to :score_changeable_obj,:polymorphic => true
+end
diff --git a/db/migrate/20140617013146_create_user_score_details.rb b/db/migrate/20140617013146_create_user_score_details.rb
new file mode 100644
index 00000000..e830e3e0
--- /dev/null
+++ b/db/migrate/20140617013146_create_user_score_details.rb
@@ -0,0 +1,19 @@
+class CreateUserScoreDetails < ActiveRecord::Migration
+  def change
+    create_table :user_score_details do |t|
+      t.integer :current_user_id
+      t.integer :target_user_id
+      t.string :score_type
+      t.string :score_action
+      t.integer :user_id
+      t.integer :old_score
+      t.integer :new_score
+      t.integer :current_user_level
+      t.integer :target_user_level
+      t.integer :score_changeable_obj_id
+      t.string :score_changeable_obj_type
+
+      t.timestamps
+    end
+  end
+end
diff --git a/test/fixtures/user_score_details.yml b/test/fixtures/user_score_details.yml
new file mode 100644
index 00000000..ac8da802
--- /dev/null
+++ b/test/fixtures/user_score_details.yml
@@ -0,0 +1,27 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html
+
+one:
+  current_user_id: 1
+  target_user_id: 1
+  score_type: MyString
+  score_action: MyString
+  user_id: 1
+  old_score: 1
+  new_score: 1
+  current_user_level: 1
+  target_user_level: 1
+  score_changeable_obj_id: 1
+  score_changeable_obj_type: MyString
+
+two:
+  current_user_id: 1
+  target_user_id: 1
+  score_type: MyString
+  score_action: MyString
+  user_id: 1
+  old_score: 1
+  new_score: 1
+  current_user_level: 1
+  target_user_level: 1
+  score_changeable_obj_id: 1
+  score_changeable_obj_type: MyString
diff --git a/test/unit/user_score_details_test.rb b/test/unit/user_score_details_test.rb
new file mode 100644
index 00000000..657a9c2f
--- /dev/null
+++ b/test/unit/user_score_details_test.rb
@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class UserScoreDetailsTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end