近年来黄河中游区间入黄水沙量发生了明显变化，对此变化特性需要开展研究。依据黄河中游干流水文站 实测资料将黄河中游河口镇至潼关区间分为头道拐－吴堡、吴堡－龙门、龙门－潼关 3 个区域，分析各区域水沙量的变化 趋势及入黄贡献率变化。结果表明: 1958－2016 年头道拐站及三个区域的年径流和年输沙量均呈显著减小的变化趋势。 2000 年后头道拐入黄水量贡献率增大了 6．8%，中游区间三个区域的水量贡献率均减小，减小值为 1．9% ～ 2．5%; 头道拐 的沙量贡献率增加了 7．4%，头道拐－吴堡区间的沙量贡献率减小了 22．5%，吴堡－龙门及龙门－潼关区间的沙量贡献率增 加值分别为 5．1%和 10%，黄河中游区间入黄沙量贡献率减小了 7．4%。头道拐站的入黄水、沙量贡献率基本一致，黄河 中游区间入黄沙量贡献率的减少是由区间上部区域引起的。河潼区间的输沙量与径流量相关性较好。

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．