Abstract: This paper analyzes the formation mechanism of strong convective weather in Fujian 10-12 April 2012 by using the intensive ground observation data, automatic station data, conventional observation data and the reanalysis data of NCEP. The results show that this severe convective weather process occurred against the stable large-scale circulation background. The superposition of low-level convergence and upper level divergence, the good water vapor transmission, the unstable atmospheric stratification and the high CAPE value provided the necessary thermodynamic conditions for the development of strong convection. The surface mesoscale convergence line touched off the development of convection, and the invasion of middle-level cold air increased the instability of atmospheric stratification strengthening the development of convection. The maximum upward motion level of the center was higher than 0 ℃ level and strong vertical wind shear are conducive to the formation of hail. The potential forecast analysis of severe convective weather and the trace analysis with satellite, radar and automatic station data are an effective way to do severe convective weather forecast warning.