Abstract: Construction industrialization uses modern industrial production methods to design and construct buildings.As a new construction technology, BIM technology can realize the informatization construction of the project, and by means of visualization and virtual simulation, it realizes the transparency throughout the whole process of the project and increases the controlling ability over the participants so as to prevent risks.Based on the characteristics of the assembly building application and Cai HongWan project, this article studies the application of BIM technology during the whole process of assembly building design, component processing, construction and maintenance.