USA:
The United States is the World’s oldest surviving federation. It is a constitutional republic. In the political system, the United States has adopted a "separation of powers" system of checks and balances of the system and the rights of the executive, legislative, judicial, these three basic rights by the President, Congress, and the courts were undertaken and mutual restraint in order to maintain the balance of the right structure. On the relationship between central and local implementation of federalism, federal and local has a set of relatively independent authority as follows:
美国是世界上现存最古老的联盟。这是一个宪政共和国。在美国的政治制度，采取了“分离权”系统的互相制衡的制度和权利的行政，立法，司法，这三个基本权利的总统，国会，法院进行了和相互制约，以维持合理的结构的平衡。在中央和地方之间的关系，实行联邦制，联邦和地方都有一套相对独立的权威如下：
President is responsible for dealing with the internal and foreign affairs of the United States; legislative power by the congress consisting of a power house (direct election by a voter house of representatives) and an upper house (By the senate of the state election). In The political party system to the implementation of the two-party system, Republicans( Economically and socially conservative, called ‘right wing’) and Democrats (More liberal on social issue,called ‘ left wing’) in charge of state power in turn.
负责处理内政外交的美国总统是由国会的立法权由电源的房子（一个选民直接选举的众议院）和上院（参议院通过的州选举）。在实施两党制的政党制度，共和党人（经济上和社会上保守的，被称为“右翼”）和民主党（更多自由的社会问题，被称为“左翼”）负责的国家权力反过来。
(The merits of the political system: the powers of the President of the United States, President subject to the constraints of political parties is a small, independent, quickly make a political decision to improve governing performance. Its weaknesses are: the three major U.S. power system of mutual restraint, and to contain, resulting in the consumption of some of the institutional. President no power to dissolve Congress, can only veto a bill passed by Congress Similarly, Congress can impeach the president, the use of the veto to reject the President)

UK：
The British political system is a the typical constitutional monarchy, its main feature is the "parliamentary supremacy" that is the legislative power of the core position of the three powers.//

First, the British parliamentary democracy, reflect the the principle of parliamentary supremacy. Next, Cabinet is the core of power to making the main decision and it is composed of Minister, by the House of Commons representatives ,However, important decisions must be approved by the house of commons and house of lords that is man legislative organization, the house of commons is democratically elected in general elections. The house of lords is not