Abstract: National security is the basic premise for the survival and development of country, and the most fundamental guarantee for safeguarding national interests. Water security is a vital part of national security, which not only ensures sustainable economic and social development, but also supports food security, energy security and ecological security. Water safety has always been a major issue of national security and stability, it is of great significance to study national water security issues. Based on the analysis of national security needs and research results on water security, this paper proposes the idea of establishing a second-level discipline (or branch discipline) of "national water security discipline" under the framework of the first-level discipline of "national security discipline", and defines the concept and orientation of national water security discipline. Then, the discipline system framework of national water security discipline is proposed, including its research object, theoretical system, methodology and application practice. Finally, considering the needs of discipline development, we put forward the development prospects of national water security discipline, which can provide reference for the further improvement and development of national water security discipline.