本文建立了一个程控电活交换网的计算机仿真模型,它采用了分级仿真技术,以减少运算时间和计算机内存,使这一大型的仿真成为可行.此外,还引入了反馈功能、模块化结构等,并应用事件驱动的真实过程仿真.最后,用该模型对各种典型的拥塞现象进行了仿真分析,试图揭示拥塞的内部机理. In this paper, we establish a computer simulation model of program-controlled electro-live exchange network, which uses a hierarchical simulation technology to reduce the computing time and computer memory, so that this large-scale simulation is feasible.In addition, the introduction of the feedback function, modular structure , And apply event-driven real process simulation.Finally, this model is used to simulate various typical congestion phenomena and try to reveal the internal mechanism of congestion.