By rough set theory applied to the basic concepts of electricity customers in the analysis of the quality of services, focused on how to measure the importance of attributes specific to the method used in the analysis. Through Zigong customers' questionnaire of service quality as an example, the analysis indicates that the approach based on rough set of customer service quality can simple and effective analyze the important influencing factors on the quality of customer service, and provide a theoretical basis for future power enterprises to improve service quality.