本文介绍了以面向对象方法实现机械传动原理图的生成系统，并论述了采取的关键技术。机械传动原理方案图采用了两种生成方法，一是由专家系统推出的数据文件拼接生成；二是根据用户需要，用基本传动单元直接拼接而成。本系统是机电产品原理方案自动化设计系统的重要组成部分，并有较强的独立性，可供技术人员进行各种机械传动原理方案设计时使用 This paper introduces the generation system of mechanical transmission schematic diagram by object-oriented method, and discusses the key technologies adopted. The principle of mechanical transmission scheme diagram using two generating methods, one by the expert system introduced data files generated splicing; the second is based on user needs, with the basic drive unit splicing directly. The system is an important part of the automation design system of mechanical and electrical products principle scheme, and has a strong independence, for technicians to use a variety of mechanical transmission principle of the program design