本文在论述了编组站按图行车类型及特点的基础上，得出了适用于分析编组站按图行车问题的M/M（a，b）/s排队模型，并给出了其算法框图及计算结果。通过对理论计算结果的分析，论述了影响编组站按图行车质量的各种因素，并提出了各种情况下编组站按图行车的优化策略。 Based on the discussion of the type and characteristics of the marshalling yard according to the drawing, this paper obtained the M / M (a, b) / s queuing model which is suitable for analyzing the maneuvering problem of the marshalling yard according to the drawing. Calculation results. Based on the analysis of the theoretical calculation results, various factors that affect the quality of driving in the marshalling yard by figure are discussed, and the optimization strategy of marshalling yard by figure driving in various situations is proposed.