With the development of science and technology, 3S technology has been more and more widely applied in various disciplines and research fields. In the land supervision, the application of 3S technology can produce more dependable data for land supervision to follow and make land supervision more efficient and powerful. This paper has studied all the work done by Bureau of State Land Supervision and summarized the application and enforcement of 3S technology in land supervision in detail with the purpose of making researchers in the field of land management better understand the work of land supervision. Some examples given in this paper show that the application of 3S is very important in land supervision. This paper also discusses some problems existent in the land supervision system based on 3S technology and gives corresponding solutions. This paper can provide reference for further improvement and optimized designing of the information system for land supervision.