Abstract: In the conditions of triple play, and full service operation of the complicated competitive environment，the domestic carriers choose IP multimedia subsystem (thereafter shortened by IMS) as a mainstream to transform full service and evolve next generation network. Successively, they begin to exploit IMS construction， provide government， enterprises， family and person with IP integration service based on the advantages of IMS technology. In this paper, it described the advantages of IMS technology which would offer people the improvement of information and experience.