Abstract: Deterministic networks can provide deterministic network performance metrics, such as determined end-to-end delay and data transmission reliability. This is important for key services such as automatic control of power systems and smart grid differential protection which require ultra-low delay and highly reliable communication guarantee. Firstly, this paper analyzes the key needs of the current power communication networks in stability assurance. Then, combined with the characteristics and technical requirements of the existing power communication networks, the technical architecture of the 5G deterministic network is introduced, and several key technologies in deterministic networks are analyzed. Finally, the potential application scenarios and deployment schemes of 5G deterministic networks in power communication networks are discussed. The proposed 5G deterministic network technology can provide low latency and high precision synchronization for the power communication system, and support the stable and reliable operation of the system.