For the energy management method for hybrid electric propulsion system was studied, an energy management strategy based on fuzzy logic control was presented. By setting the fuzzy membership function of VTOL(vertical take-off and landing) aircraft′s power requirement, internal-combustion-engine-generator′s output power, and the state of charge of battery, the output power of generator and battery were dynamically optimal allocated. So as to increase the fuel economy and aircraft range effectively. According to the model establishment, the energy system changes of 100 kg scale VTOL aircraft were simulated, and simulation results demonstrate that the algorithm was practical. Results indicate that energy management strategy based on fuzzy logic control can effectively improve the performance of hybrid electric propulsion system, during the 1.2 h flight, ICE(internal combustion engine) can run approximately 1 h with the lowest specific fuel consumption, and can improve the energy efficiency of hybrid electric propulsion system.The conduction provide design thoughts and analysis method for energy control and arrangement of hybrid electric propulsion system.