A clear clarification of research categories is the foundation and prerequisite for the development of a discipline. To categorize National Security Studies is to make a systematic and theoretical generalization of the concept of national security. Based on the entire process of national security work and the practical issues it focuses on, National Security Studies is divided into three levels: problems, intermediaries, and goals. The research categories of National Security Studies can be further refined under the guidance of the holistic approach to national security. This paper reveals that national security problems defined in the reverse path of national security exhibit collective and dynamic characteristics, constituting the object category of National Security Studies; the intermediary category of National Security Studies, which centers on basic patterns of National Security Studies, aims to explore solutions to national security problems. As a linking factor, China’s security patterns and principles have absorbed not only universal and traditional security norms but also those in specific fields. The goal category of National Security Studies lies in the survival and development of the state, focusing on the integrity and unity of the state, the safety and prosperity of its people, the continuity and resilience of its political system, and the stability of the international environment