EU climate policy is one of the focal fields of foreign researchers. Their researches mainly focus on the development of EU Climate policy, EU’s internal climate policy, EU's climate diplomacy, EU's international climate leadership and the influence of EU climate policy. Among these fields, EU Emission Trading System （EU ETS), EU's positions in international climate negotiations as well as EU's international climate leadership are paid great attention. Generally speaking, research on EU climate policy in western academic circles can easily be divided into several phases; most researches are conducted from economic angle while the political implication of EU climate policy is not emphasized. In addition, a comprehensive and theoretical study of EU climate policy is still weak.