On the basis of the observed data of precipitation,sediment and runoff during1959-1997 years in the Zhifanggou watershed,this paper analysed the relationships between precipitation and change characteristics of inter-annual sediment,and monthly variations,and between the annual precipitation and annual runoff,average annual soil erosion modulus,degree of control in a period and average annual sediment delivering in the same period as well.The results showed that the rainfall distributed uneven during the ye...