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为了深入研究多式联运运输方案优化问题，将问题抽象成为组合优化问题，并将交叉熵方法应用于多式联运问题的研究.探讨综合运输的背景下，寻求运输成本、转运费用等最小化的运输方案，提出了针对多式联运运输方案选择问题的交叉熵算法，并给出了计算步骤和相应的计算方法.在计算过程中，为了验证本文提出算法的有效性，采用节点扩展的网络图描述多式联运网络，进而转化为最短路问题进行求解.结果表明，运输成本、转运费用对运输方案起到关键作用，并且提出的交叉熵算法能够很快收敛.

A Cross-Entropy Method for Solving Selection of Multimodal Transportation Scheme

To investigate the multimodal transportation scheme optimization problems,this paper transfers the problem into a combination optimization problem,and a cross-entropy method is employed to solve the problem.In an attempt to find the best transportation scheme under the background of integrated transportation with the minimized cost,a targeted cross-entropy method is proposed and the specific calculation steps are also listed.In the process of calculation,to verifies the efficiency of the cross-entropy method nodes split network is employed to describe the multimodal transportation,,and the problem is transformed to be a shortest path problem.The result shows that transportation and transfer cost plays a significant role in the problem,and the proposed cross-entropy method can realize the optimization of transportation scheme.