Using conventional and intense automatic observation, CINRAD/SA and wind profiler radar data, the environmental conditions, structures and evolution of two supercell storms are analyzed. The results are as follows: (1) Favorable conditions for the severe convective weather process are large vertical wind shear, high level cold and low level warm, high level dry and low level moist, right height of 0℃ and -20℃ layer and large convective available potential energy (CAPE). The trigger of the severe convective weather is low pressure on surface, convergence line, low level frontal zone. (2) The common characteristics of the two supercell storms are three body scatter, weak echo areas, stronger echo intensity, VIL density value over 4 kg·m-3, and moving rightward 30° with upper wind in the mature stage. (3) The meso cyclone of long life supercell storm Ⅱ lasts more than 2 h, strong updraft causes hails to grow, and storm Ⅱ lasts 6 h. At the same time, high level divergence is longer. Meso cyclone of supercell storm Ⅰ lasts only 18 min, high level divergence and updraft are weak, and their lives are short. These differences are closely bound up with the environmental conditions such as vertical wind shear and vertical vorticity.