本文从并行处理的概念引出了分布式计算机系统,对它的定义和系统结构特点给以阐述。接着从互连拓扑方式出发,系统地介绍了总线式、交叉开关式、开关枢纽式的不同系统结构及其内在联系。最后扼要地叙逆了分布式系统的发展前景。 In this paper, the concept of parallel processing leads to a distributed computer system, its definition and system structure characteristics to be elaborated. Then, starting from the interconnection topology, we systematically introduced the different system structures of bus, crossbar and switchgear and their internal relations. In the end, it summarizes the development prospect of distributed system.