Electric propulsion UAV has great development potential, is expected to create a green and low-carbon development highland, and become a new growth engine of low-altitude economy. Electric propulsion system has changed the power plant of aircraft, and its potential “dimensionality reduction competition” with gas turbine engine has the possibility to change the future aviation engine industry structure. The conceptual design of electric propulsion system can be divided into all-electric mode and hybrid mode. The all-electric mode is currently limited by the battery power capacity and life problems, and the development is relatively limited. In the hybrid mode, the power system plays an auxiliary role to achieve the miniaturization of the gas turbine and improve the efficiency of the overall power system, which is the mainstream development direction of the future electric propulsion system. In order to meet the requirements of high speed and high thrust, low cruise fuel consumption and ultra-high electric power of future UAV, the design is based on the hybrid propulsion system of all-electric engine series/parallel. The engine adopts distributed and multi-electric design to realize the all-electric control system, fuel accessories, lubricating oil accessories and actuating mechanism. The advanced control system balances and manages the working state of the engine and battery energy sources to ensure the stable operation and best performance of the platform power and high-power equipment.