With the rapid advancement of the informatization process of China’s construction industry, the requirements for the integration of engineering design and construction are getting higher and higher. The quality of engineering design and the level of design management directly affect the quality of construction. The emergence of the EPC (Engineering, Procurement, and Construction) model overcomes the shortcomings of the traditional contracting model, but it is still not ideal in terms of work integration and information transmission. BIM (building information modeling) is a collaborative process of creating, managing and exchanging information throughout the construction project. BIM has revolutionized the construction, engineering and construction (AEC) industry. This paper examines the problems related to current project design management in China and their causes. On the basis of summarizing the existing research on design management, it introduces a form of BIM integrating design BIM and construction BIM, so as to better depict the leading role of design in the construction process. By analyzing the changes in organizational management and communication methods brought about by BIM, this paper optimizes and innovates upon the traditional project design process in view of the problems in project practice. It advances BIM design work, increases detailed BIM design work and enables the downstream participants to intervene in the design stage, so as to develop a more smooth and efficient design workflow, which provides operable work detail guidance for BIM-based design management in the future.