Abstract: Taking Bojili Irrigation District which diverts water from the Yellow River as an example, this article determined the infiltration coefficient of canal and uplift coefficient of ground water by means of theoretical method, according to the data of canal seepage observed in three ways. The relationship between seepage losses and discharge in canals and sub-main canals, was established by regression analysis method, which is based on canal classification and the empirical equation of canal efficiency related canal discharge. As this assessment method can get relevant canal efficiency only depended on the basis of canal discharge, it has the distinct characteristics of simplicity, feasibility and practice and can provide rational basis for drawing up the water conveyance and allocation plans.