Abstract: In order to achieve the variant quantity characteristics of flow and sediment in the Qingshuihe River basin in different time periods, including flood and non-flood seasons, inter annual and intra seasonal periods, the variation process of flow and sediment volume is analyzed systematic with the method of applied statistics for filed data. The long-series measured materials contain the flow and sediment data gained at three hydrological stations, namely, Guyuan, Hanfuwan and Quanyanshang sites. The change-point analysis of hydrological time series is implemented with Mann-Kendall method for obtaining the mutation year for each hydrological station. The results indicate that the mutation time of each station is asynchronous for annual runoff and sediment load. Moreover, the amount of water and sediment at each station is decreasing in recent years. Compared with the tendency in the long term, the water volume increased by 10% in 2010−2015 at Quanyanshang station and decreased at other stations. The range of water and sediment reduction is 58.8%～65.7% and 64.3%～94.4%, respectively. 58.5%～65.6% of annual water volume and 85.6%～89.4% of annual sediment volume occur in the flood seasons in the Qingshuihe River basin. The distinction of water and sediment in wet seasons and dry seasons is significant for inter-annual periods. A preliminary analysis is underway for the factors affecting discharge and sediment supply, including rainfall, slope soil-water conservation engineering, reservoir operation mode and silt arrester construction.