The UPnP and IGRS are the two main protocols to connect seamlessly in the field of digital devices. Because the formats of the description of device and its services by these two protocols are different, devices which base on different protocols can not be identified and linked directly. In view of this situation, this paper analyses the difference between the two main protocols from the level of internal mechanisms and explains the feasibility of interoperability which bases on different protocol, so this makes the resource sharing of information equipments and collaboration services possible. This paper provides theoretical support for the interoperability of the IGRS and UPnP devices.