In recent years, under the background of scientific and technological innovation and massive engineering construction in the new era, the engineering technologies such as BIM+IoT and BIM+5G have gradually matured. However, due to the factors such as the amount of miscellaneous data and cumbersome clients, the problems such as insufficient application depth and poor application effect of BIM Technology have not been well solved in the actual application process of engineering projects. Combined with the construction of smart campus project of University of Shanghai for Science and Technology, this paper studies a set of secondary development platform based on BIM lightweight technology, which aims to optimize the display effect and interactive operation of BIM model, so as to facilitate the sharing of BIM model anytime and anywhere. The lightweight platform design can help project personnel communicate and quickly analyze BIM engineering information, and improve the management efficiency of engineering personnel.