本文分析了类用户－服务器业务模式下ＡＴＭ交换机几种典型缓冲系统布局形式的性能特点；对于ＬＡＮ中的交换机来说，用户－服务器模式更接近于代表业务的真实容量。而许多应用场合中的通信业务可以用类用户－服务器业务模式来表达，因此有必要研究这种业务下的ＡＴＭ交换机缓冲存储器策略；本文以计算机仿真的手段评估了四种典型缓冲结构的队列长度概率分布情况，进而得出了这种特定业务模式下的最佳缓冲存储器布局。 This article analyzes the performance characteristics of several typical buffer system layouts for ATM switches in a class-subscriber-server business model; for a switch in a LAN, the subscriber-server model is closer to representing the true capacity of the service. However, the communication service in many applications can be expressed by the class-user-server business model. Therefore, it is necessary to study the ATM switch buffer strategy in this business. In this paper, the queue lengths of four typical buffer structures are evaluated by means of computer simulation Probability distribution, and then come to this particular business model of the best buffer memory layout.