Based on the observational records covering the period from 1954 to 1999,the characteristics of precipitation changing in dasha river watershed and its connection to sediment yield were studied using tendency analysis and correlation analysis .Results showed that the rainfall in this watershed had a down tendency in spring at a rate of -7.4 mm/10 a,summer and Annual precipitation at a rate of -13.06 mm/10 a and -4.6mm/10 a. The correlation analysis shows that the amount of sediment transport has a very close relation with rainstorm of 100 mm and 50~100 mm of daily rainfall.