Abstract: The 14th Five-Year Plan has set higher goals for architectural digitization, calling for the transformation of production relations and modes driven by digital transformation. This paper takes the application of the third phase expansion project of Baiyun Airport (Longkou Xiaobu) as an example, combined with the research on enterprise digitalization, to improve the overall digital design level of enterprises by building a comprehensive digital system. By establishing a comprehensive digital system, the digital design level of the enterprise is improved overall. This study establishes BIM standards, utilizing the customization of three-dimensional platforms and the development of tools, creating linkage between three-dimensional models and two-dimensional drawings, enabling rapid modeling and drawing, and improving the process of forward design. This enhances the overall efficiency of the team, solves the key and difficult problems in project digital design, enables digital design for the project, and facilitates subsequent reference and promotion.