The protection setting group calling mechanism of IEC61850（the first edition）consists in obtaining protection settings information through the request-response pattern，which cannot meet the demand that the multi-agent system be self-adapted online to obtain the latest protection settings enabled by the intelligent electronic device（IED）.The service tracking mechanism of IEC61850（the second edition）is applied to real time monitoring the attribute parameters of the protection setting control block.This paper constructs the protection settings online service tracking system based on multi-agent technology.Within it，the service tracking unit on IED in substation real time online obtains protection settings modified and enabled by the protection relay equipment，the protection setting supply agent supplies the latest protection settings to the multi-agent system online，the conversion unit obtains the latest enabled protection settings，which harmonizes the IEC 61850 standard and the foundation for intelligent physical agents（FIPA）standard and resolves the protocols conflict from the substation automatic equipment layer and the multi-agent system on the computer management layer.The example analysis results show that the constructed system is feasible and effective.