With the development of information technology

the information security has become crucial for the stability of power systems

and it is very important to ensure the validity of access entity. In consideration of the requirement on interoperability and security in the architecture of the next generation EMS/MMS

emphasis is placed on the issue of the intelligent logging-on system. Based on the module and service-oriented architecture

by using new information technologies such as security assertion markup language (SAML)

extensible markup language (XML)

simple object access protocol (SOAP)

WS-Security etc

this paper describes the design of an intelligent logging-n system

which is centralized in the identity authentication management and distributed in the access authorization management. Through the analysis of an instance

this model is demonstrated to meet the requirements of future power systems on integration and reuse.