Air vehicle fuel system altitude performance testing system and method

The invention provides an air vehicle fuel system altitude performance testing system and method. Fuel used for work of a to-be-tested fuel system is injected in a fuel tank in the system, the fuel tank is placed in a constant-temperature box, the constant-temperature box and a temperature sensor are combined to guarantee that the fuel in the fuel tank is stably at the constant temperature required for a test; the fuel tank is connected with a high-altitude gas pressure simulation device through a gas pipeline; the high-altitude gas pressure simulation device adjusts the gas pressure in the fuel tank according to the current testing height and is combined with a pressure sensor, so that the pressure in the fuel tank in the stable state is the pressure corresponding to the testing height; the fuel supply end of the fuel tank is connected with a fuel supply pipeline of the to-be-tested fuel system, the fuel supply outlet end of the to-be-tested fuel system is connected with the fuel pressure sensor and a fuel f