Abstract:With the development of BIM technology, the design of water supply and drainage structures is trying to apply BIM technology into the practice. The Xiaoshan Qianjiang Wastewater Treatment Plant Phase IV Extension Project is located in Xiaoshan Qianjiang Farm, Hangzhou City, Zhejiang Province. Its design scale is 400 000 m3/d. and it is a semi-underground box-type wastewater treatment plant (WWTP). Revit software is used to establish a three-dimensional model. Combined with YJK software, the structural calculation of underground WWPT structures is explored to prove the possibility of using the three-dimensional model for overall calculation of underground WWTP projects.