Abstract: Constructing the new power system is an important development direction of national energy strategy of China, and ensuring the cyber security of the new power system is very significant. First, this paper deeply analyzes the cyber security risks introduced by the changes in the power supply structure, grid form, business model, and technical basis in the environment of the new power system. Then, combined with the existing cyber security protection measures, the cyber security protection requirements for the new power system are proposed in terms of trusted access, intelligent perception, precise protection and linked response. Finally, the key technologies of future new power system cyber security involving access security, endogenous security, data security, communication security, security assessment and simulation verification and other key research and application directions are discussed and prospected.