Combined with the construction principles and requirements of new generation intelligent substation, a merging unit intelligent terminal integrated set is proposed. The merging unit functions and intelligent terminal functions are completed in an IED. This paper presents a method of exchanging information of SV and GOOSE in a single port. Merging unit and intelligent terminal functions can be independent of each other in the device. The designed device strengthens the function of device status monitoring. Design of the device has higher intelligent levels.