The numerical method to solve the equation for spatial amplification theory is described in detail . deduced first - order system equations from spatial instability theory and its eigenvalue problem are solved and neutral lines varied with mach numbers are given 运用稳定性理论的空间放大理论,建立稳定性方程,得到一个六元一阶方程组,然后求解该一阶系统,计算并得到不同马赫数下的中性稳定曲线,基于此得到不同马赫数下流场的临界失稳点和稳定区域。