针对在用电营业ＭＩＳ系统建立过程中电费计算无法统一处理的问题，分析了大用户电费计算复杂的原因，给出了一种电费分层计算模型和算法实现，成功地解决了建立用电营业ＭＩＳ系统的核心问题．实践证明，此算法可解决以前在电费计算过程中大用户的电费无法统一处理的问题． Aiming at the problem that the calculation of electricity bill can not be handled in the process of establishing electricity business MIS system, the paper analyzes the reasons for the complex electricity bill calculation of large electricity user, and presents a model of electricity charge layering and algorithm implementation. It successfully solves the problem of establishing electricity business MIS system of the core issues. Practice has proved that this algorithm can solve the problem of electricity tariffs that can not be handled by large users in the process of calculating electricity charges in the past.