Abstract: Based on the historical materialism of Marxism, with a sight of historical facts of the development of the modern politics in America and Europe this paper dialectically analyses the objective existence, cause and manifestation of the two different trends between the party's country orientation and the country's party orientation, thereby giving a clear explanation of a fact that a political system of a country is determined by its history and the circumstances that it is in no unified world model should be regarded and taken as it has been advocated in a wrong way. It is a good political system as long as it can bring Freedom, Democracy and Equity to the world and support the peace and stability of the world besides the development of the economy both at home and abroad.