The polar environment is complex and diverse, with low temperature all year round and accompanied by polar night conditions. In order to rationally configure the capacity of the polar environment microgrid system, and improve the reliability of it, so China's Antarctic Scientific Research Station-Zhongshan station is regarded as the research object. According to the characteristics of the polar environment, a wind-hydrogen-storage microgrid capacity optimization model is proposed, that uses surplus wind power to produce hydrogen and is equipped with battery energy storage devices. Considering the real-time impact of low temperature on wind turbine output, battery capacity and electrical load, taking the minimum annual cost of systems as the goal, the loss of power supply probability as the constraint, the capacity of the microgrid power supply system in the polar environment is optimized. The simulation results of the example are to be proved that the wind-hydrogen-storage system can not only improve the system economy and reliability, but also effectively reduce energy waste.