This paper outlines the basic principles of process-layer network GOOSE message communication between intelligent substation secondary devices and analyzes possible multi-device sharing relationship between receiving terminal and sources such as start failure input, single/double protection configuration, block/unblock signal, etc. The switch value sharing schemes of multi GOOSE source corresponding to one receiving equipment, multi-receiving equipement corresponding to one GOOSE source, GOOSE wide sharing among multi secondary equipments, etc. are proposed. The implementation scheme of multi-device sharing is expounded in terms of failure GOOSE input sharing, charging hand-switch GOOSE input sharing, mutual blocking reclosure between double-set configuration, measurement and control equipment cross dual net up-sending warning, etc. The isolation principles based on auxillary electrical circuit after such multi-sharing GOOSE input switching into secondary devices are given.