机械传动系统是由若干个机械组成的。构成机械传动系统的机构及其耦合方式不同，就会产生不同的传动特性，就能够适应各种不同的工作需要。本文提出线性耦合与非线性耦合的新概念，并在此基础上研究机械传动系统的组成规律，以拓宽机械传动系统的综合的思路。 Mechanical transmission system is composed of a number of mechanical. Mechanisms that make up a mechanical drive system and their coupling are different and produce different drive characteristics to suit a variety of different work needs. In this paper, a new concept of linear coupling and nonlinear coupling is proposed. On the basis of this, the composition rules of mechanical transmission system are researched to broaden the train of thought of mechanical transmission system.