Abstract: This paper presents a linear mathematical model and method of digital simulation for supersonic inlet dynamics. A simplified steady-state mathematical model and a linear dynamic model of supersonic inlet are combined into an antegral one. Thus, it can be used to calculate the steady-state characteristics and to simulate the linear dynamic behavior of both axisymmetrical and two-dimensional supersonic inlets under certain operating conditions directly. The simulated dynamic responses of a NASA 48cm axisymmetrical and a NASA 2200cm two-dimensional supersonic inlets are quite agreeable with the experimental data.