Abstract: The simulation research on the air-assisted injection system of kerosene piston engine was carried out.Firstly,a mathematical model of air-assisted fuel injection system of an engine was established.Then a physical model of air-assisted fuel injection system was built and checked, and the effect of structure, operation and environmental parameters on the characteristics of the fuel system was analyzed.The results show that the smaller the volume of the pressure stabilizing chamber,the amplitude of pressure fluctuation is the larger.The greater of the pressure difference,the fuel flow is the greater under the same injection pulse width;Oil temperature has little effect on fuel flow.The higher the altitude,the slower the pressure build-up.As the altitude increases,so does the time it takes for the gas pressure to reach 600 kPa.The research provides a theoretical basis for the fuel system matching machine.