摘要:正向设计通俗理解为三维模型输出二维图纸，且符合各阶段审图规范，丰富的“族库是灵魂”。Revit作为民用建筑领域较为广泛的BIM软件，各类工程项目以其为平台所绘制的三维可视化模型和最终的二维图面表达，主要通过软件本身提供的“族”构建而成。本文从实现BIM的正向设计三维模型基础元素——族出发，对现有族库管理工具的应用功能，以及分散式管理族所存在的问题进行分析。提出了族库管理工具的建设需求建议，通过机械设备族的应用案例展示，探讨完善族构件在使用过程的维护和更新工作，以点带面推动BIM正向设计技术的发展。

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.