The data generated in the process of planning, construction and management of buildings and structures are various and large-scale, so a unique, consistent and efficient coding is urgently needed. Beidou grid location coding stipulates its grid selection and coding rules, as well as the identification, transmission and big data processing of spatial location information, which has good scalability in the field of building spatial identification location coding. Based on the coding rules of Beidou grid location code, this paper puts forward the coding technology of building space identification location, and codes the building. The coding is unique, consistent and efficient. The application of coding rules is introduced, including the generation of coding, the index of coding, and the corresponding query algorithm, which is verified by engineering experiments.