AbstractDownburst in thunderstorm mainly refers to the outflow on frontier and the strong wind shear caused by the downburst. In this paper, the thunderstorm evolution is divided into three stages as growing, mature and dissipating stages according to its development. Based on meteorological data, trends of relevant parameters are presented. Then with the 3D ring vortices method, the classical fluid mechanics theory is applied through adding linear source model to simulate the distribution of velocity in the wind shear field and its evolution over time. This modeling method could effectively simulate the evolution of downburst, and is suitable for engineering application.