This paper aims to establish an optimized model for distributed web—based collaborative system on drawing documents in construction projects.The analysis and design of system framework were carried out based on the requirements analysis and latest information technology to determine the optimized scheme.Several feasible schemes were obtained by applying the techniques of web service and digital right management, and then the optimized scheme wag identified through comparison.This study has laid a solid foundation for the development of distributed web-based collaborative system on drawing documents in construction projects