Beijing Sifang Automation Co.Ltd.，Beijing100085，China

The focus is on the realization method of the smart substation data center，including the organization and access of the data center.Based on the unified modeling techniques，this method is committed to effectively merging and connecting the data in all related professional fields，while storing the data according to the standard model.Taking the multi-source measurement as a connection center，the data center provides various data access services based on the primary equipment object.An architecture of substation automation system based on the data center is provided，and the deployment of the data center and the information interaction are studied.An architecture of substation external application service based on the data center is proposed to establish standard information service independent of communication protocols，thus providing various common data services and application-oriented services to the dispatch center and the local intelligent applications.