The temporal and spatial distribution of hail and thunderstorm in Wutai mountain and nearby plain region were discussed.Results show that it is in the Wutai mountain area that convective storms happened frequently.There were four possible cases of convective storms crossing over the mountain,e.g.① convective storms stagnate,decrease and disappear voer western Taihang Mountain;② the upper of convective cloud cluster across voer the mountain turns into medium and high cloud;③ the initial cloud cluster across over the mountain generates new convective cloud cluster;and ④ convective cloud cluster across over the mountain formates downslope storm.