This article analyzes the characteristics and current application status of 3D model based on digital delivery, and proposes the technical difficulties and challenges faced by the application of 3D models. It focuses on the research on lightweight technology, post-processing technology and standardizing technology for 3D models in typical scenarios in refineries, and explores the best practice route of lightweight model and model transformation based on digital delivery, which is verified in the intelligent ethylene project of Zhongke (Guangdong) Refinery and Petrochemical Company Limited. The application scenarios of 3D models for refineries are further explored, and the transformation requirements of typical scenarios for 3D models are put forward, providing a wider application scope for 3D models.