本文以理论推导和实验研究为基础，提出了多微孔莫－堇滤料滤层反冲洗计算公式和防止双层莫－堇－煤滤层发生混杂必须满足的条件。所得公式计算精度较高，不仅可用来指导莫－堇滤池的设计，而且可作为其它多微孔滤料反冲洗计算的参考。 Based on the theoretical derivation and experimental research, this paper proposes the formulas for backwashing of multi-microporous Mo-堇 filter media and the conditions that must be met to avoid the occurrence of mixing of the two-layer Mo-堇-coal filter. The obtained formula has high calculation accuracy, which can not only be used to guide the design of Moh-堇 filter but also can be used as a reference for the calculation of other multi-hole filter backwashing.