中文摘要：

通过认知实验，探讨出行者倾向于选择环路的影响因子。以北京市三环路为主要研究对象，按照12方向城市坐标框架和三环路路段的现实名称划分特点提出九宫格模式。以两点和封闭曲线的拓扑关系为标准，从道路起点、终点和九宫格的拓扑关系中选出18种典型情况进行分析。测试及统计分析实验结果显示，路径起点和终点、冗余路段比重、路径方向影响出行者对环路的选择。

英文摘要：

The spatial relation is one of the important theories of geographic information system. It refers to the geographical en- tities which have some spatial characteristics relationship among them. Route choice is one of the researches of the spatial relations. It involves the relationship of the topology,distance and direction. This paper is for the purpose of exploring the ring road tendency influencing factors on route choosing to people＇s choice of road travel, and providing the reference mode for the way inquiry. The Third Ring Road of Beijing was taken as the main object of the study. According to 12 direction city reference frame, and the reality division characteristic of the Third Ring Road section names,the Third Ring Road and its internal area were di- vided into nine parts with horder,angle,venter（three regions）. By the topology relation of the two spots and closed curves, 18 kinds of typical situation were selected from the relationship between the path and the three regions. Finally,through cognitive experiments on 100 people of Beijing, the statistic data were gotten and the analysis was done from three variables（the start-terminal location, the directions of north-south and east-west, the proportion of redundant sections）. The results confirm that tendency of the ring road factors influence the traveler to choose the ring road.