Regional economic geography is an important part of regional geography and important branch of economic geography in the geography system. The research content of regional economic geography is economic regions and economic regions system, including the development mechanism, impacting factors, constructed types, and operation law of regional system. The main features of this subject include regional characteristics, general characteristics and system characteristics. The realistic base of regional economic geography is physical geography, and the theory base is economics, meanwhile it is closely linked with human geography and department of economic geography. The main results are that the academic theory of regional economic geography has widely used in the regional development in China. Mr. Chen Cai has made outstanding contributions to improving the theoretical basis and the discipline of Chinese local regional economic geography in its development process. After summarizing the current situation from methods system and application of regional economic geography, the authors point out that there are three trends of regional economic geography. Firstly, regional economic geography, new economic geography and regional economics continue to interact with each other and develop together. Secondly, the theory of "Three-dimensional target space" will be a epistemology of researching regional economic geography. Thirdly, the development of low-carbon economy will give a new meaning of regional economic geography.