In recent years，the contribution rate of water and sediment into the middle reaches of the Yellow Ｒiver has changed significantly． According to the observed data of hydrological station in the middle reaches of the Yellow Ｒiver，the middle reaches of the Yellow Ｒiver is divided into three regions of Toudaoguai － wubao，Wubao － longmen，Longmen － tongguan． The variation of contribution rate of water and sediment entering the Yellow Ｒiver is analyzed in different periods． The results show that the runoff and sediment load in Toudaoguai Station and three regions showed a decreasing trend from 1958 to 2016 year． After 2000 year，the water contribution rate of the toudaoguai increased by 6．8%，the water contribution rate decreased by 1．9% ～ 2．5% in three regions． The contribution rate of sediment load for Toudaoguai increased by 7．4%．The contribution rate of sediment load in the up region decreased by 22．5%． The contribution rate of sand load for the middle and lower reaches increased by 5．1% and 10% respectively． There is a significant correlation between sediment transport load and runoff in the middle reach of the Yellow Ｒiver．