For resolving the problem that the maturity performance evaluation system for metering suppliers is not constructed in power company, performance evaluation management system is proposed and designed. The paper analyzes the management mode of the metering suppliers at present. The performance evaluation index system in tree structure based on the key index analysis and mechanism of weighting correction are used to establish performance evaluation model of metering suppliers. The hierarchical management model is designed. Many functions of the system are achieved, for instance, task management, after-sales service management, performance evaluation management and intelligent decision management. The operation result shows that the system standardizes the supplier relationship management of the company and provides an effective technical evaluation means for metering suppliers performance evaluation.