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大型气田集输管网的布局可采用分级优化方法来解决，分为网络布局优化和管径组合优化。采用ＳＩ算法确定出最优网络布局；在管径优化组合部分，建立了合理的数学模型，采用混合离散优化ＭＤＯＤ算法来求解数学模型，得到优化管径组合和各节点的优化压力。
Large-scale gas field gathering and distribution network layout can be used to solve the hierarchical optimization method, divided into network layout optimization and pipe diameter combination optimization. SI algorithm is used to determine the optimal network layout. In the optimization of pipe diameter, a reasonable mathematical model is established, and the hybrid discrete optimization MDOD algorithm is used to solve the mathematical model to optimize the pipe diameter combinations and the optimization pressure of each node.