Water and soil conservation practices in the Wei River Basin (WRB) may influence the Lower Wei River (LWR) itself and the Lower Yellow River (LYR), of which the Wei is a tributary. Based on data of measured and natural runoff and suspended sediment load (SSL) in the WRB, the connections between runoff and SSL from the WRB and deposition in the LWR, the elevation of Tonggguan Hydrology Station, and deposition in the LYR are analyzed. For the compound effects of human activity and climate change in the WRB, the amount of deposition reduction in the LWR during 2000-2009 is about three times what it decreased during 1970-1979. For per square kilometers of soil conservation, the effect of human activities in the WRB on deposition in the LWR during period of 2000-09 is about four times that of the period of 1970-1979. As decreased runoff and SSL from the WRB, deposition in the LYR decreased during the periods of 1970-1979 and 1990-1999, while deposition in the LYR increased during the periods of 1980-1989 and 2000-2009. For the planned reservoir in the Jing River Basin, the decreased deposition in the LYR may be smaller than that of the LWR.