The SSRF power supply control system is a fully distributed control system based on the EPICS system.About 65K runtime database records run in the 27 VME/IOC controllers to make physics access more than 600 sets of power supplies distributed in the SSRF facility.In this paper
the layered system architecture and its working principles are introduced.The EPICS-based control solutions for the PSI-designed and SINAP-designed digital controllers are described.The hardware and software
together with the communication technology applied in the system