本文根据大系统分解的思想,将城市污水管网系统市局的优化设计分解为递阶的两级:第一级,主干管输水路线的优化;第二级,次干管和支管市局的优化。利用Dijkstra算法和Prim算法能方便地求出优化解。对某市的实际设计表明,它比传统方法节省费用,有良好的经济效益。 Based on the idea of ​​large-scale system decomposition, this paper decomposes the optimal design of the urban sewage pipe network system into two stages: the first stage, the optimization of mains water transmission routes; the second-level, sub-mains and sub-branches Optimization. Dijkstra algorithm and Prim algorithm can be used to easily find the optimal solution. The actual design of a city shows that it saves costs compared to traditional methods and has good economic benefits.