Abstract:According to methods of statistics and Matlab wavelet, this paper analyses annual and monthly precipitation in the years from 1957 to 2009 in Nanao. The results show that: annual precipitation is mainly concentrated in the months from April to September, which accounts for 80.5% precipitation and presents double peak; the highest peak of precipitation is in June and the secondary peak is in August, which is distributed before and after the flood season; the rain period and less rain period are a...