Abstract: In recent, aerosol which is a passive jamming method has been taken seriously by the military and has been widely used in the modern super-science local war because of its obvious economic benefits and great practicability. The aerosol particles' motion equation was presented in this paper. By using the finite-difference method, the motion equation and a mathematical model of aerosol sedimentation and diffusion were given in difference expressions, and a dynamic model of aerosol sedimentation and diffusion was formulated. Method of numerical simulation of aerosol dynamic sedimentation and diffusion was presented. The consistence of the simulation experiment's result and smoke chamber experiments show that the model presented in this paper can accurately simulate the motion of aerosol, which is significant in the research of aerosol material and aerosol behavior, the dynamic simulation experiment of aerosol jamming and the performance evaluation of aerosol jamming.