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在分析运输界对车流径路研究成果的基础上，根据中国铁路网的特点，运用系统论的观点，针对已有模型在车流已知情况下只对重车流径路进行优化的不足，提出了在一定运输需求条件下对路网上双向、空重车流径路同时进行优化的多目标线性规划模型。改进了ＧＰ－ＳＴＥＭ算法，并在此模型和算法基础上对一算例在微机上进行了计算。
On the basis of analyzing the research results on the traffic flow path in the transport industry and according to the characteristics of the Chinese railway network, using the viewpoint of system theory, aiming at the shortcomings of existing models only optimizing the heavy traffic flow path when the traffic flow is known, Under the condition of transportation demand, a multi-objective linear programming model is proposed to simultaneously optimize bidirectional, empty and heavy traffic paths on the road network. The GP-STEM algorithm is improved, and an example is calculated on the microcomputer based on the model and algorithm.