The lightning activities Beijing area were monitored with single station lightning detection system(M-LDARS)in summer of 1995—1997.The result shows that the relationship between diurnal variation of lightning frequency and severe convection weather.In the different weather types,such as hail or heavy rain,the proportions of ground flash and cloud flash aren't the same.The high amounts of cloud flash are attributed to the presence of hail,and a great deal of ground flash associated with the observations of heavy rain.