Abstract: In order to study the occurrence of severe convective weather in weifang development mechanism and characteristics of reducing wind hail about the dangers of severe weather, such as work for later spring and summer season severe convective weather forecast sum up experience, improve the prediction accuracy, especially for the severe convection weather process diagnosis analysis. This paper, by using conventional meteorological data section and sounding analysis, at the same time combined with radar and satellite cloud image short-term approaches to analyze causes of numerical forecast products, it is concluded that the occurrence of such a severe convective weather characteristics and types. The results show that the severe convective weather is one of the important reasons is the northeast cold eddy is maintained and strengthened. Hail occurred in 2 PM, the lower temperature, abundant energy. Forward the structure of the upper trough to top dry cold air superimposed on the low-level warm moist air, lead to unstable stratification, triggering the severe convective weather.