Thanks to the rapid development and large-scale application of technologies e.g. the Internet of Things, mobile internet, and big data, intelligent construction has led a new round of construction industry revolution. However, in the field of engineering project construction, there are still many problems e.g. low collaboration efficiency, difficulty in searching engineering data, slow information synchronization, and difficulty in sharing data information among all parties etc. BIM technology, based on three-dimensional geometric models, realizes the visualization management of engineering data in time and space in digital form, which is a method to handle current engineering project management. Taking the second phase of the Futian Water Purification Plant project as an example, this paper elaborated on the application requirements and organizational framework of BIM, and clarified the application advantages of BIM construction management platform in the entire lifecycle of engineering projects. Moreover, a detailed analysis was conducted on the basic functions of the platform including BIM applications, progress, quality, safety, collaborative office, smart construction sites, and image and text management. What's more, the paper explored some optimization solutions for digitalization and informatization of water purification plants, which were found available in reducing design changes, shortening construction periods, and improving construction efficiency.