Abstract: This study uses climate trend coefficient method，mathematical statistics and probabilistic method to study the temporal and spatial distribution，Variation and Inter-annual trend of the thunderstorms by using the thunderstorm observation data（including monthly average thunderstorm days，annual thunderstorm days， the first and last date of thunderstorm of the year，the days between the beginning and end date of 35 weather stations in severely damaged area and most damaged area in Sichuan territory of Wenchuan earthquake from January 1981 to October 2010.