With the development of a new generation of information technology represented by BIM, GIS, Internet, IoT, AI, cloud computing, etc., an era of large-scale data generation, sharing, and application has arrived. Construction companies involve long upstream and downstream chains, and the amount of data generated and collected is very rich. This data hides the value law of the process of building project approval, design, construction, delivery, and operation. It is also an important asset of an enterprise. The construction industry will gradually enter the DT era and the core of realizing enterprise data assets is digital delivery. Since the government and the industry have not yet formulated specific standards and requirements for digital delivery, the completion and handover still adopts the method of physical files as the main and electronic files as the supplement. Therefore, completed digital delivery is a concerned topic of the entire industry, and it is urgent to study and explore effective methods and measures to promote the realization of digital delivery. This article comprehensively reviews the participants and business characteristics of the project completion and delivery industry chain, summarizes and analyzes the key points and pain points of the project completion and delivery business, defines the scope of the project completion digital delivery business and the delivery object, and proposes the BIM-based project completion digitalization delivery plan. And on this basis, this paper researches and designs a digital delivery system for project completion to solve the problem of collection of business data in the process of project construction, and realizes digital integrated delivery such as completion filing, urban construction archives, operation and maintenance delivery, etc., which will form project data assets to support construction companies to transform from construction and development to operation and maintenance services.