The architectural decoration began to adopt BIM technology in the design and construction stage of decoration engineering in recent years. In order to improve the utilization rate of data flow and implement BIM smoothly, enterprises need to select a BIM technical route suitable for Decoration Specialty in the process of decoration design. This paper analyzes several technical routes formed in the application of BIM at the stage of decoration designing, and puts forward different ways to select and combine BIM technical routes at design stages of different decoration project, which has practical significance for the transformation and popularization of BIM application in decoration industry at present.