The BIM Technology is already widely applied in the construction of complex railway projects. For the promotion of integrity and effectiveness of information sharing and exchange in the whole life cycle of railway projects to ensure the BIM data can be effectively utilized, this paper proposes an extension method of IFC standard for railway station building information model based on the international IFC standard. After fully understanding the inheritance relationship between IFC entities, the authors add new entity classes to the IFC standard framework, apply transformation tools to obtain new entity class files, and finally verify the feasibility of the IFC data extension method on the NMBIM collaboration platform.