In this article, the formula of interception efficiency and electrostatical attraction efficiency of the single granular is proposed by adopting the single sphere model. Moreover, the total efficiency formula of EGB is presented. 本文采用孤立球模型,推导出孤立颗粒的截留效率计算式和静电效率计算式,进一步提出了EGB除尘总效率计算式。