It is inevitable to convert the version of Revit model during the modelling, application, and management stage of BIM implementation due to the flexible application scenarios. However, the industry is still lacking solutions to downgrade Revit models. Through the secondary development of Revit, this paper customized the tools to convert the version of Revit model. The mechanism is that it collects and stores the key information of major components as an intermediate file format, then adopt another version of Revit to read the intermediate file for creating corresponding components by calling API to achieve the version exchange., Therefore, the model version is downgraded for using purposes. Taking Shandong Jinan Shulan Hospital project as an example, this program validated that the proposed method for downgrading Revit model can significantly decrease the time consuming.