Precipitation is an important recharge source for springs in Fusong County. Therefore, it is of great significance to explore the change regulation and extreme value probability of precipitation for continuous replenishment of spring. For this, firstly, based on the precipitation data during 1960-2013 and spring discharge data during 1981-2008, the distribution characteristics of precipitation were analyzed through the calculation of the mean precipitation value in a year and between different years; Next, Pearson III model was used to analyze the distribution of the largest precipitation probability; And then, the wavelet analysis was used to analyze the annual precipitation power spectrum, extracting precipitation period between the year 1960 and 2013 at the same time; At last, the cross wavelet method was used to analyze period relation between the amount of mineral water resources and precipitation. The results show that during the 54 years between 1960 and 2013, annual precipitation had a period change, and the variation coefficient is 1.017*10-17, which reflect the precipitation is stable, with no abnormal changes. The main oscillation period of precipitation and spring discharge are both approximately 11 months, and both of them shared the same phase (the spring discharge having an immediate reaction with the change of precipitation). As an important recharge factor for the mineral water in the study area, precipitation can effectively guarantee the supply of mineral water resources