： In recent years, annual runoff in the Zhanghe River Basin has been significantly decreased, which is effecting on the w ater resources management and sustainable utilization. The variation characteristics of the annual runoff in the Zhanghe River Basin were analyzed by using the various statistical methods. The results show that there presents a decrease trend of the annual runoff in the basin, and there is a more obvious decrease trend in the lower and middle reaches; The annual runoff before 1980s is higher than the mean annual runoff during 1960-2013 and that after 1980s is much lower. The abrupt change points of the annual runoff series have been detected occurring in the late 1970s. And there is a quasi-period of 6-7 years in the annual runoff series.