Since the influences of speed, interval of stations and passenger traffic density on urban rail transit lines length are reflected on the economic net benefit of urban rail transit, with an overall consideration of the efficiency and benefits of urban rail transit lines, factors that influence urban rail transit line length are analyzed, a model with the maximum value of the relative net benefit is established. The calculation results show that the urban rail transit line length, the average interval of stations and the economic benefits present a parabolic relation, the three factors are mutually restricted. Thus a relationship graph between benefits, the average interval of stations and the line length in common combination conditions of various influencing factors is obtained, examples are given to show the cross-station passenger traffic flow that could be met when the cross-station operation mode is adopted.%在综合考虑城市轨道交通线路经济效益的基础上,分析了影响城市轨道交通线路长度的因素.以相对净效益最大为目标建立模型,研究速度、站间距、客流密度对线路长度的影响程度.计算结果表明:城市轨道交通线路长度、平均站间距与经济效益均呈抛物线关系,三者之间相互制约.得到了各影响因素常见组合情况下效益-平均站间距-长度关系曲线图,并举例论述了采用跨站运营时需满足的跨站客流量.
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