Due to the existence of solar panels, the installation height and wheelbase of the rotor have an impact on the aerodynamic performance of the whole machine. The non-constant constant value simulation of the flow field of the whole machine is carried out by XFlow software based on the particle method lattice Boltzmann technique. The simulation results show that the height of the rotor has little effect on the lift of the whole machine. The larger the installation wheelbase of the rotor is, the larger the lift of the whole machine is. The main reason is that when the wheelbase is small, the lower wash flow generated by the rotor impacts on the board. The whole machine produces pneumatic interference. According to the simulation results and the whole machine, the analysis shows that the best installation method of the rotor is half-wheelbase R=859mm and height H=55mm, and provides some reference for the design of similar aircraft in the future.