Digital sport, as a new model of sports development in the digital era, plays an important role in the construction and innovation of the "Three Systems" of sports discipline with Chinese characteristics. This paper, using the methods of literature research, comparative analysis and logical reasoning, probes into the practical significance, theoretical value and practical approach of digital sport in constructing the discipline system, academic system and discourse system of sports discipline with Chinese characteristics. The research holds that digital sport has expanded the research domain of sports humanities and sociology, activated the vitality of sports education and training research, enhanced the necessity of traditional sports science research in the contemporary times, and promoted the application level of sports human science research, and is a time proposition in perfecting the discipline system of sports discipline with Chinese characteristics ; digital sport innovates sports knowledge system, sports academic theory system and sports research method system, and is the key support to the construction of sports discipline with Chinese characteristics; digital sport has enriched and expressed the ideological discourse, platform discourse and value discourse of sports discipline, and is an important field to build the discourse system of sports discipline with Chinese characteristics. Therefore, we should make continuous and accurate efforts in defining the position of digital sport discipline, promoting the academic innovation of digital sport and seizing the highland of digital sport discourse, so as to transform China's comparative advantage in the global digital competition into the digital sport governance efficiency, and make the due contribution to the construction of the "Three Systems" of sports discipline with Chinese characteristics. [ABSTRACT FROM AUTHOR]