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The energy system is one of the key systems of satellite.Once the energy system failure,it can easily lead to failure of other systems.Therefore,the energy system safety is crucial to the satellite in orbit.For GEO satellites,the eclipse is a common astronomical phenomenon.When the satellite is in eclipse,due to the Earth or Moon blocks the Sun,the energy of solar array will decline,the battery will discharge,and the operation mode of energy system will change.Especially,"complex eclipse",which is generated by the continuous alternate block of the Earth and Moon,will bring satellite energy supply worse influence,easily lead to failure of satellite.Therefore,to analyze the impact of complex eclipse to the energy system safety is quite necessary.Firstly,this paper describes the principles of complex eclipse,GEO satellite energy system and the influence to the energy system caused by the complex eclipse,furthermore determines the relationship between eclipse and the operation mode of energy system,analyzes the energy system safety in GEO satellite complex eclipse,establishes the reasonable disposal strategy based on the result and applies it.The conclusions show that,the eclipse does affect the energy system of GEO satellite,the method given by this paper is to ensure the energy system safety in GEO satellite complex eclipse with practical value.