The analysis of precipitation characteristics at the Songhuaba Station from 1953 to 2011 indicates that the precipitationin the Songhuaba water source area of Kunming has a decrease trend, the precipitation highly concentrated in main flood period,and precipitation is less than normal in post -freshet period, which is unfavorable for flood control and reservoir storage. Theresults of wavelet analysis show that the annual precipitation, the precipitation of flood period, main flood period and post-freshetperiod have short period of 2 years. The annual precipitation, the precipitation of flood period and main flood period in large timescale can be divided into the high-water period before 1977, low-water period from 1977 to 1993, high-water period from 1994 to2008, low-water period from 2009 to 2011. The precipitation of post-freshet period in the larger time scale can be divided intothe low-water period before 1957, high-water period from 1957 to 1968, low-water period from 1969 to 1982, high-water periodfrom 1983 to 1997, and low-water period from 1997 to 2011. The wavelet analysis shows that the low-water period after 2009will last about 11 years.