Based on the optimal control theory, this paper has established the scheduling model in the system network and the formula of computation of the nonlinear cost-time curve.

本文应用最优控制理论，建立了非线性成本曲线的系统网络优化模型及计算公式。

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Finally, we establish a cost formula about public traffic system, and bring forward a solution of shortest path of public traffic network.

建立了城市公共交通网络的阻抗函数，给出了公共交通网络最短路径的求解方法。

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