Abstract: In the area of Northwest Power Grid,the design standard of cutting generator circuit of stability control equipment is not uniform,and the loop wiring forms are various,which brings great risks to the safe operation of stability control system. Taking some main thermal power plants in Northwest China as samples,the connection forms of cutting generator circuit of stability control equipment in the power plant are summarized. Combined with the technical regulations of stability control system and a typical accident case,the problems existing in each form of the cutting generator circuit are analyzed,and feasible improvement measures of cutting generator circuit are proposed. Good results have been obtained after field application,which provide solid foundation for the safe operation of stability control system.