Abstract: This paper studies the single-node hardware configuration solution of power NFV IMS in regard to the differences in user capacity and traffic models when IP multimedia subsystem is used in the power industry and general commercial fields. Based on the standard configuration of commercial IMS, hardware resources are gradually reduced until the service is damaged. Appropriate redundancy is added according to the business security requirements of the power system. Large-scale pilot tests show that under a model of 200 000 users and 5000 concurrency, power IMS virtualization hardware resources can be compressed to 70.59% compared with commercial configurations. The research results can support the engineering design of state grid IMS virtualization evolution.