The aircraft fuel system is one of the core systems of the aircraft and is essential to the safe and reliable flight of aircraft. In order to solve the problem of the offset of the aircraft centroid due to the unreasonable distribution of fuel supply from multiple fuel tanks during the longitudinal flight of aircraft， this paper analyzes the principle of aircraft fuel supply and establishes a fuel centroid model for the longitudinal motion of aircraft. On this basis， a complex method is adopted. The optimal fuel supply strategy of aircraft is determined in real time according to the aircraft pitch angle and the fuel volume of each fuel tank. The simulation results show that after the required centroid of a given aircraft changes， the fuel supply strategy determined by the method in this paper can control the offset of the aircraft centroid within a reasonable range， and realize the dynamic adjustment of the fuel supply strategy according to the required centroid. The method has theoretical and practical engineering application value.