Based on the analysis of present situation of power supply system of Dongtan Coal Mine, Yankuang Group Co.,Ltd., this paper analyzes the existing problems of relay protection, then puts forward the optimization scheme. The optimization scheme used in Dongtan Coal Mine, reduces the incidence rate of expansion of power supply system and power supply system of accident trip.%文章在分析兖矿集团东滩煤矿供电系统现状的基础上，分析继电保护存在的现有问题，并提出有针对性的优化方案。优化方案在东滩煤矿的使用，降低了供电系统越级跳闸及供电系统事故扩大的发生率。
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