In order to explore the process of aerosol cloud formation caused by explosive dispersive stimulant in divided structure, firstly, a test sample grenade with divided charge structure was designed .Secondly,the principle sample bomb was divided into two types: ground explosion and air explosion under static conditions.The formation and movement of aerosol cloud during the process of explosive dispersive o-chlorobenzylidene malononitrile(CS) irritant agent were studied by using high-speed photography technology,and the variation rules of diameter,,radial velocity and diffusion height of aerosol cloud group with time were obtained,the results of ground explosion and air explosion dispersion tests being different. Finally,through the theoretical analysis of irritant aerosol cloud movement process driven by explosion, the mathematical model of velocity is established which agrees with the experimental results.Results showed that in both ground and air explosions ,the general rules of the explosive dispersive CS irritant agent process of the divided structure are basically consistent,which can be divided into radial acceleration stage,deceleration stage,turbulence stage and diffusion stage. The cloud parameters at the end of the first two stages can provide the initial conditions for predicting the effective area of explosive tear gas and estimating the power range.The maximum velocity of ground explosion is 1495 m·s^-1 at 0.7 ms, and that of air explosion is 1697 m·s^-1 at 0.3 ms.Compared to an air explosion, for an ground explosion, the shockwave produces reflection superposition on the cement ground, which is conductive to the diffusion of the radial movement of the flow field and particles, and the ground explosive dispersive cloud group has a larger diameter,while the axial diffusion height is small.