Based on the observation data of flow and sediment of Zhuangtou Station of Beiluo River in the period of 1960-2010 and test results of the cross section of sedimentation in the lower Beiluo River in the period of 1960-2017, the variation characteristics and cause of scouring and silting in the lower Beiluo River were studied. Changes of sedimentation amount, typical cross section and river bed slope were analyzed with prototype observation method. And then, the trend of runoff volume and sediment transport amount of Zhuangtou Station was tested with Mann-Kendall method. The results showed that the cumulative sedimentation amount of Luoyu 1- Luoyu 21 reach was 2.870×108 m3 in the period of 1960-2017, during which the floodplain height and river slope increased from 1.618 in 1965 to 1.941 in 2017. The initial storage period of Sanmenxia Reservoir and hyper-concentrated sand flood period were the major sedimentation periods of the river. During flood period in 1994, the sedimentation of Luoyu 1- Luoyu 21 reach accounted for 31.3% of the total cumulative sedimentation. The flow and sediment condition and Tongguan elevation are the main reasons of variation of scouring and silting in lower Beiluo River. The runoff and sediment transport amount of lower Beiluo River decreased significantly since 2000. The average sediment transport amount from 2000 to 2010 of Zhuangtou Stations decreased by 67.5% ,compared with that from 1960 to 2010. And overflowing flood was a rare occurrence. With the implementation of maximum water level of 318.0 m since the prototype experiments started in Sanmenxia Reservoir, Tongguan elevation gradually droped, generally ,the scouring and silting situation maintained stable.