The non-uniform coefficient of distribution of years and concentration degree of the Qingjian River precipitation were calculated in great detail based on the monthly precipitation data measured at Zichang station from 1959to 2008.The method of Mann-Kendall rank correlation is used to analyze the annual and seasonal precipitation change trend and the mutation of precipitation series. Results indicated that uneven distribution coefficients of rainfall years change little and precipitation is relative concentration；precipitation interannual variation and alternation cycle is longer than the other；the year precipitation on the whole shows a trend of decrease and has two mutations in 1964and 2005.