根据沙玉清教授挟沙力为双值关系的论点 ,在分析研究实验室及野外原型观测资料的基础上 ,对沙玉清的挟动比速公式作出含沙量影响的校正 ,得出了临界淤积、临界冲刷两个挟沙力公式 .公式既能用于一般挟沙水流的冲淤问题 ,又能用于高含沙水流的冲淤问题 ,尤其是较好地描述了黄河下游清水冲刷呈现的难点 ,物理概念明确 ,物理图形清晰 ,经黄河实测资料验证 ,公式有良好的适用性 According to Professor Sha Yuqing’s claim that sand power is a double value relationship, based on the analysis of research laboratories and field prototype observation data, Critical sedimentation, critical scouring two sediment carrying capacity formula.Formula can not only for the general scouring silt sediment flow problems, but also for scouring and silting sediment flow, especially a better description of the Yellow River water scour Difficulties presented, a clear physical concept, physical graphics clear, validated by the Yellow River measured data, the formula has good applicability