Abstract: As is normally understood, the forward design is to generate 2D drawings directly form 3D models that conforms to the drawing specifications in each stage, where a rich family library will act as the soul. As a popular modeling software in the civil construction field, Revit acts as a platform serving for various engineering projects with 3D modeling visualization and 2D drawing representation. The Revit models are mainly consisted of elements of the family in the software. This paper starts from the family, the basic element for forward design implementation based on 3D BIM model, and analyzes the functions of existing family bank management tools and the problems existed in decentralized management families. Suggestions on the construction requirements of family bank management tools are put forward, and then demonstrated through a case study of machinery and equipment families. How to improve the maintenance and updating of family components in the operation process of building will be discussed, in order to promote the development of BIM forward design technology by point and area.