Abstract: In the process of using computer for the design of buildings, the data sharing of all professions in the building industry is one of key issues for the effective use of information technology. CAD layer is a kind of technology to realize data sharing, but it needs to define the standard first for its real application. This paper introduces the main contents of the most important foreign architectural CAD layer standards including the ISO 13567 standard, the AIA standard and the BS 1192 standard—the layer organization and naming format, and the practical application situation of these standards, which provide a reference for the domestic to establish national standards.