Abstract: By analyzing conventional sounding diagram simultaneously with data of regional AWS, Doppler radar and wind profile, researches have been done on the analysis of evolution characteristics, especially discussing the causes of theformation process, favorable environmental conditions and the strong convection continuing to strengthen the squall lines occurred on April 10, 2012 in Jiangxi province. Result shows that this convection process was forced and triggered by the warm advection in front of trough, and the severe squall lines and other supercell storms led to that disastrous event. The good conditions that led to the convective weather with hail and wind gust on the ground include strong vertical wind shear, the existence of suitable 0/-20 ℃ height and conditions as dryer on higher layer and wetter on lower layer. The advantage of long-time existence of surface mesoscale convergence and temperature front in the middle and north region of Jiangxi province promoted the continued enhancement of squall line and other supercell storms. The convection echoes formed in the regions of more obvious temperature gradient, and also near the regions of wind convergence.