Some restrictions relevant to the application of generic object oriented substation event（GOOSE） in process layer are listed. The important factors concerning reliability and maintainability of operation system， maneuverability of solution along with application scope of GOOSE are pointed out. It brings forward rules about data categorizing of relay protection and priority of events. The affection of GOOSE application to the current design habit is analyzed. The virtual terminator concept is introduced which integrates the design criterion of traditional substation and digitized substation.