本文给出一般网络系统可靠性评估的一种有效算法 .首先将系统化为等价的网络图 ,利用开关网络的理论 ,定义系统成功函数 ,给出求网络的输入节点到输出节点的所有最小路集的方法 ;其次 ,定义排它算子 ,对网络进行有效、简便不交和处理 ,并导出其可靠性表达式 .最后给出范例以说明算法执行过程 In this paper, we give an efficient algorithm for evaluating the reliability of a general network system.Firstly, we systematize it into an equivalent network diagram, and use the theory of switch network to define the system success function, and give the minimum of all the input and output nodes of the network Second, the definition of exclusive operator, the network is effective, easy not to deal with, and derive its reliability expression.Finally, an example is given to illustrate the implementation of the algorithm