Abstract: At present, the quantity calculation for solar-thermal power station projects predominantly relies on traditional manual methods, which are time-consuming, labor-intensive, and prone to significant errors. In response, this study proposes a 3D calculation method system centered on Revit as the core modeling software, integrated with Sweethome's professional calculation plugin. By comparing this approach with traditional manual calculation modes across three dimensions - efficiency, accuracy, and convenience - the research thoroughly validates the remarkable advantages of the 3D calculation method. This innovation effectively addresses the inefficiency issues inherent in traditional manual calculations. Project practice demonstrates that adopting the 3D calculation method achieves over 60% improvement in efficiency, effectively controls error rates within 1%, enables multi-disciplinary collaboration, and ensures data traceability. This provides reliable technical support for the digital management of the entire project lifecycle. The standardized 3D calculation method established in this study offers a replicable technical solution for the digital transformation and upgrading of similar engineering projects.