提出有向双环网络G(N;r,s)的容错路由及容错直径的概念,根据L-型瓦的叠加原理,研究了容错节点所对应的最优等价节点的分布规律.利用L-型瓦的4个参数a,b,p和q,给出有向双环网络G(N;r,s)的容错路由算法及其容错直径的计算公式.根据该算法进行容错路由,当有向双环网络G(N;r,s)中出现故障时,网络的可靠性和信息传输延迟将达到最佳状态. The concept of fault-tolerant routing and fault-tolerant diameter for bi-ring network G (N; r, s) is proposed. According to the superposition principle of L-shaped tile, the distribution law of the optimal equivalent node is studied. The four parameters of a, b, p and q are given, and the formulas of fault-tolerant routing algorithm and fault-tolerant diameter for a directed double loop network G (N; r, s) are given. According to the algorithm, fault- Network G (N; r, s) in the event of failure, the network reliability and information transmission delay will reach the best condition.