采用线性稳定性分析的方法推导出了普遍三维形式下空心圆柱射流自由表面扰动发展的特征方程，着重考察了射流内部与外部气体密度不相同的情况，数值计算表明了气液交界面上气动力在射流分裂与雾化过程中始终起着不稳定的作用，而内外气动力的作用不同，尤其对非轴对称扰动而言，外部气动力的作用随Ａｈ数的增大变得更加剧烈，而内部气动力的作用则相反． Linear eigenvalue analysis is used to deduce the characteristic equation of free surface perturbation of hollow cylindrical jets under general three-dimensional form. The density of gas inside and outside the jets is emphatically investigated. Numerical calculations show that the aerodynamic forces In the process of jet splitting and atomization, it always plays an unstable role, and the aerodynamic effects of internal and external aerodynamics are different. Especially for non-axisymmetric perturbations, the effect of external aerodynamics becomes more intense with the increase of the number of Ah, The role of internal aerodynamics is the opposite.