Abstract: In view of the thermal control risk caused by the highly integrated electronic equipment in the micro aircraft, a thermal design scheme of the isothermal enhanced heat transfer with graphene layers is proposed based on the orbital parameters and the structural properties of the small spacecraft. Firstly, a thermal model of the orbital state of the aircraft is established, and then the transient temperature distributions under high temperature and low temperature conditions are discussed. The effect of the graphene thermal conductive layers of different thicknesses on the isothermal property of the small spacecraft is analysed. The results show that the temperature range of the main parts and units can be narrowed significantly, In addition, it is shown by experiment that the graphene layers can also improve the temperature uniformity on the outer panel of the small aircraft.