Abstract: In this paper, the kinetic factors of tornado formation are discussed, including vertical motion, energy concentration and release, and vortex development. Strong vertical motion in strong convection depends on the horizontal wind velocity in the middle troposphere. The occurrence of strong wind in the middle troposphere is the signal of strong convective development, and is also a prediction index. At the same time, the large vertical motion must causes strong convergence between the middle and low troposphere, so the strong convergence zone below the middle troposphere is also an important index to predict the development of cumulus. In the process of energy analysis, the most important thing is to find the energy convergence line. If the convergence line encounters a larger vertical motion, the energy will be released at the regions of the maximum vertical motion of the convergence line, so that the cumulus system will be developed. In relatively flat areas, if there is buoyancy curl in larger convergence line and energy extreme line, the vortex will be produced. This vortex further causesthe formation of horizontal velocity and vertical movement, then it strengthens the vertical movement of the rotational zone, so that vortex column forms, namely the tornado appears.