轨道交通在发展过程中出现大量的超长线路，各省市在规划建设中也存在着诸多问题。通过对现有文献进行梳理，总结影响线路长度的主要因素，包括城市规划与城市形态、客流效益、经济效益和社会效益、时间和速度目标值、系统制式与运营组织及线路直达性等，确定超长线路的长度范围；在此基础上，统计国内城市轨道交通超长线路，对其特点进行分析；针对其特点提出几点思考，包括超长线路出现的客观原因及国内超长线路规划建设可吸取的经验等，以期为同类城市轨道交通规划与设计提供借鉴。

During the development of rail transit, a large number of ultra-long lines have appeared, along with many problems concerning the planning and construction of various provinces and cities. This paper summarizes the main factors that affect the length of the route, including urban planning and urban form, passenger flow benefits, economic and social benefits, time and speed target values, system standards and operation organization, and line accessibility. It further determines the range of ultra-long line length and, based on these statistics, analyzes and discusses domestic urban rail transit ultra-long lines and their characteristics — e.g. the objective reasons behind the emergence of ultra-long lines — to inform domestic planning, etc.; ultimately intending to provide a reference for similar urban rail transit design and planning.

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