Abstract: In this paper, an online antimaloperation system based on GOOSE in substation is proposed to overcome the existing shortcomings of traditional antimaloperation system. Firstly, the characteristics of GOOSE technology and its application to substation are introduced, and the function of online antimaloperation system in substation is analyzed. Then realization modes of such models as monitor system, measuring and controlling device, intelligent control box and lockset, are discussed in detail. In the end, some suggestions on processing abnormal conditions are proposed.