卫星通信网是一个规模大、造价高的复杂通信系统,计算机仿真技术作为一种辅助手段具有非常重要的作用。通过仿真,可以简化设计过程,缩短设计周期,避免设计的盲目性,从而节省大量的人力物力。着重介绍了在网络仿真软件OPNET上如何建立一个基于话音业务的ALOHA接入方式的卫星通信网模型,并对该模型进行了仿真。 Satellite communication network is a large-scale and high-cost complex communication system. Computer simulation technology plays a very important role as an aid. Through simulation, you can simplify the design process, shorten the design cycle, to avoid the blindness of the design, thus saving a lot of manpower and resources. This paper mainly introduces how to establish a satellite communication network model based on the ALOHA access mode of voice service in OPNET, and simulates the model.