The construction of integrated supervision and control system of smart substation determines modularization development of future advanced application function, which aims at realizing interchangeability of advanced application modules among different manufacturers. However, there is no standardized design of advanced application function and lack of universal model for information interaction service among different advanced application modules at present. Therefore, this paper takes sequence control as research object and extends scram/automation data object and video surveillance linkage logical node (LN) according to IEC 61850 standards. Secondly, unified model for sequence control function is structured with the extended collaborative diagram. Finally, the paper presents an information exchange service model based on Data Server’s sending back GOOSE message. Whereby, the paper completes the standardization of sequence control function and realizes the interchangeability in modules from different manufacturers, which further improves the generality and expandability of the whole system function in substation.