With the continuous development of computer processing capability and software functions, applications related to the BIM-based 3D design of the AEC industry been gradually popularized.There have been many practical BIM-based methods in in volume scheme selection, construction submission and concept design, construction drawing design of each specialties, 3D deepening design, and etc.However, it is still difficult to realize the BIM-based forward collaborative design in full-process and multi-professional, and the main reasons are due to the inapplicability of present BIM model storage mode for the traditional design architecture, ineffective resolution results of the BIM models, and inadequately extensive software functions due to over-dependence on foreign BIM software.This paper summarizes the current working situation, analyzes the requirements and challenges from CAD design to BIM forward design, and proposes a "digital-analog separation" BIM forward with relational database+model drawing file manager as the core.The architecture of the design platform uses the architecture to perform separate storage management of non-geometric information such as design results, school approval notes, and progress control.The unique ID values are connected to make the geometric model and non-geometric information combined into an organic whole in order to achieve integrated management.