泥沙输移比定义一直存在着不够准确清晰的缺点，对泥沙输移比概念及其影响因素进行了更深入的探讨是非常有必要的。首次在泥沙输移比公式中引入粒径、时段因子，利用量纲分析推求了不同区域的泥沙输移比公式。从理论上阐明泥沙输移比并不是单纯与整个流域面积成反比，而是与流域产沙面积成反比 The definition of sediment transport has always been the definition of the lack of accurate and clear shortcomings, the concept of sediment transport and its influencing factors to conduct a more in-depth discussion is very necessary. For the first time, the particle size and time period factor were introduced into the sediment transport ratio formula, and the sediment transport ratio formula of different regions was deduced by the dimensional analysis. It is theoretically proved that the rate of sediment transport is not inversely proportional to the area of ​​the entire basin but inversely proportional to the area of ​​sand production