中文摘要：

公交网络中线路重要度的测算是一项非常有意义的工作,线路的重要性需要从不同的角度,利用多个重要度指标来进行综合分析。鉴于此,选取公交线路节点的度、线路平均换乘机会、可达性、介数及凝聚度5个指标描述公交线路的属性,并对各指标的确定方法进行了分析;利用信息熵法确定各指标的权重,计算各条公交线路的综合重要度,各指标的权重能客观反映各指标对线路综合重要度的贡献;最后,利用兰州市公交网络进行实证分析发现：兰州市公交线路的介数指标数值差异较大,对公交线路重要度的贡献作用较大;兰州市公交线路的平均换乘机会和可达性水平差异较小,线路的平均换乘机会和可达性较好。

英文摘要：

It is very important to evaluate the importance of line in public transportation network and the importance of public transportation line should be evaluated from different viewpoints and using multiple indexes.Therefore,five key indexes are analyzed and formulated,consisting of the node degree, average transfer opportunity,accessibility,betweenness and agglomeration of public transportation line.Furthermore,the weight vector is assigned by introducing the information entropy to obtain integrative importance of public transportation line and the entropy weight can factually reveal the relative importance of each index and has high reproducibility and credibility.In the end,the Multi-index method for evaluating the integrative importance of public transportation line is tested in public transportation network of Lanzhou city,China,and the results show that the betweenness is an important aspect that greatly influences integrative importance of public transportation lines,the average transfer opportunity and accessibility with small discrepancies indicate that the public transportation lines of Lanzhou city have good average transfer opportunity and accessibility.