The power balance analysis of the high orbit satellites determines the configuration of the satellite power subsystem, which directly affects the weight of the power subsystem and even the load to interference ratio of the entire platform. The refined energy balance analysis method proposed in this paper, basis on the existing energy balance analysis based on the maximum load, this paper gives multi angle suggestions on the determination of the satellite in orbit load model, so as to achieve more accurate power design; On the other hand, in combination with the actual operating conditions in orbit, an improved design method of energy balance is proposed for the existing energy system design and the current actual load of the satellite. That is, the energy imput is reduced by adjusting the actual solar incidence angle, and the power margin is controlled within a reasonable range, thus reducting the impact of power over design on the power supply system and power transmission path, it provides a important reference for the energy balance analysis and design of high orbit satellites.