Abstract: The establishment of lunar bases is an inevitable trend in the following deep space exploration. Meanwhile,the energy system is a basic condition for keeping a lunar base working well. In this paper,basic requirements of the energy system are determined by combining lunar base energy requirements and lunar environment features. A variety of energy resources are analyzed comparatively,indicating that utilizing solar energy is the main method in the primary stage of the lunar base energy system. The core technology of utilizing solar energy is to store it with high efficiency. Based on the analysis of energy storage technologies,an energy system scheme using thermochemical hydrogen production combining hydrogen and oxygen fuel cells and photovoltaic power generation devices is proposed. The key technologies for the system design are analyzed,which can be referred in the detailed design of the lunar base energy system.