Abstract:The analysis of convective weather on 7 July, 2009 was made with the data of lightning detection, radiosonde, Doppler radar, FY series satellites and multiple surface observation whose aims are to provide theoretical basis for thunderstorm potential forecast, to deeply understand the dynamic, thermal and humidity structure of atmospheric energy, and to explore the relationships between lightning and other meteorological elements. The results show that negative flash ratio of thunderstorm is higher. But for positive flash, its strength reinforcement and scaling-up occurred after convective system reached the mature stage. Based on the energy structural forecasting method, the plot of wind and potential temperature show important signs before the occurrence of convection. Coherence existed between the number of Cloud-to-Ground (CG) flash and the speed of surface wind. Correlation between distribution of CG flashes and occurrence of high echo top, strong wind shear as well as heavy rain has been confirmed. The negative CG flashes mainly occur in the front of the region with echo intensity between 40 and 45 dBz, which has a good instructive sense to forecast the future trend of intense echo zone.