以西安市为例,通过构建路网通达性与城镇空间扩展的评价指标,采用等时线叠加法与指标分区法,并借鉴物理学中的耦合系数模型,定量研究了两者之间的耦合发展关系。研究表明:12000—2014年西安市城镇扩展与路网通达性水平均有大幅度提高,两者存在显著的耦合互动发展关系,以彼此正向影响为主,但也有个别区县在时间或空间可达性较好的地区出现城镇扩展缓慢现象。2各区县城镇扩展与路网通达性耦合协调水平呈缓慢上升趋势,但协调等级普遍偏低。3十三个区县中的灞桥区、长安区等五个区县自2000年至今一直处于扩展滞后状态。 Taking Xi’an city as an example, this paper quantitatively studies the coupling between the two by constructing the evaluation index of road network accessibility and urban space expansion, using isochronism superposition method and index partition method, and using the coupling coefficient model in physics Develop relations. The research shows that the urban expansion and road network accessibility in Xi’an in 2000-2014 both have a substantial increase in the level of interaction and coupling there is a significant relationship between the development of mutual positive influence, but there are individual districts and counties in time or space There is a slow expansion of urban areas in areas of better accessibility. 2 The coupling and coordination of urban expansion and road network accessibility in all districts and counties showed a slow upward trend, but the coordination level was generally low. Of the 13 districts and counties, Baqiao District, Chang’an District and other five districts and counties have been in an extended lag since 2000.