Abstract: At present, freight enterprises mainly adopt direct transportation. However, with the improvement of the requirements of the consignee on the supply chain, the existing transportation mode limits the development of the freight enterprises. In order to make full use of the existing highway transportation capacity, this paper studies the freight transportation path problem under the transfer mode, and expands the scope of transportation radiation. In order to solve this problem, this paper establishes a mathematical model aiming at the shortest transit time of all goods, and designs the corresponding algorithm. Finally, combined with the case data, the paper uses Python language to solve the transportation time of goods and get the optimal transportation path. It effectively reduces the transit time of road freight transportation, effectively reduces the cost of freight companies, and reduces the carbon emissions of trucks while meeting the needs of consignees.

Key words: Road transportation; Freight transfer; Optimal path; Python language

摘要： 目前货运企业主要采用直达运输方式，但随着收货人对供应链时效要求的提高，现有 的运输方式限制了货运企业的发展。为充分利用现有公路运输能力，文章研究换乘模式下的 货物运输路径问题，扩大运输辐射范围。针对此问题，建立了以所有货物的在途时间最短为 目标的数学模型，设计了相应的算法，最后结合实例数据，以 Python 语言求解货物运输时间， 得出最优的运输路径。有效减少了公路货物运输的在途时间，降低了货运企业的成本，而且 在满足收货人需求的同时减少了货车的碳排放量。

关键词: 公路运输；货运换乘；最优路径；Python 语言