Since its birth, the Communist Party of China has always attached importance to the study of the contents and manifestations of the economic laws of the capitalist system and the socialist system. It is good at innovation in combination with the specific situation of Chinese society in different historical periods, and gradually formed and continuously improved the socialist economic theory with Chinese characteristics in the arduous and tortuous exploration. The CPC's leadership of economic work and research on economic theory have generally experienced four stages: the new democratic revolution, the period of socialist construction, the new period of reform and opening up and the new era of socialism with Chinese characteristics. The first two stages are mainly characterized by the direct application of Marxist economic “source theory” analysis to guide Chinese practice, The latter two stages turned to the innovative development of Marxist economic “source theory” and the formation of contemporary Chinese Marxist economic “branch theory”. The discourse innovation process of the Communist Party of China's economic theory is the process of refining and summarizing the regular achievements of China's economic development practice and raising the practical experience to a systematic economic theory.