Methodology is one of the subjects which is taken care of in different fields of human science and in naturally has a particular importance and application in some dynamic and multi–dimensional domains such as politics. Due to the importance of political issues, one of the most important domains in politics is political philosophy, which has been discussed as one of the main branches of political knowledge for a long time. Therefore, the present paper investigates the methodology of political philosophy. The research method is descriptive –analytical. For a long time, Several methods have been used in political philosophy or it has been claimed so. Therefore, this paper reviews them, and then suggests and studies the efficient method used in political philosophy.