Optimization of collecting and distributing network of Yangshan Port considering external cost

With the rapid development of transportation industry, various pollution and transportation loss costs are increasing. Green, safe and efficient has become the development direction of future collection and distribution mode. In this paper, a linear integer programming model is established to minimize transportation costs, air pollution costs, noise pollution costs, traffic accident costs and freight damage costs. Taking Yangshan Port as an example, the validity of the model is verified, and it is found that the proportion of railway and water transportation can be increased by taking external costs into account.