中文摘要：

文章以苏州城区22个游憩点为例,从平均空间距离通达性和平均时间距离通达性分析单一公交车系统条件下和公共交通系统条件下游憩点通达性变化,并结合社会网络分析研究游憩流的空间分布变化,探究城市公共交通系统对游憩点通达性的影响程度及机理,在此基础上,提出优化苏州城区城市游憩空间对策。结果表明：（1）苏州城区各游憩点空间距离通达值决定了游憩点的时间距离通达性,公共交通系统导向下,各游憩点的平均时间距离通达性显著提高,位于轨道交通沿线上游憩点的时间距离通达性提升明显,公共自行车对游憩点通达性提升也起到一定作用。（2）游憩点的资源禀赋决定了游憩点对游憩流的集散能力,但公共交通系统压缩游憩点的时间距离通达值,从而提升游憩点的游憩集散能力。（3）在单一公交车系统条件下,游憩流模式以＂点对点＂单一目的地游憩模式和营区基地模式为主,游憩空间呈现＂双核＂格局;而在城市公共交通系统下,游憩空间行为模式呈现多样化,主要表现在线型游模式、旅行链模式、区域游模式和营区基地模式,游憩空间呈现＂多核＂格局。

英文摘要：

Urban traffic is an important guarantee for the public to pursue high quality recreational activities. At the same time, in consideration of that the development of private cars may cause traffic jam and pollute urban living environment, it is necessary to give priority to the development of urban public transport to better the urban living environment, improve the quality of urban recreation and promote the sustainable development of cities. However, there is little research on the impact of traffic,especially the public transport system on the urban internal recreational space pattern currently. Under this background, the paper takes 22 recreational spots as samples to analyze the change of the accessibility of them in the condition of only bus system and public transport system by spatial/timedistance accessibility, and the change of the spatial pattern of recreational flow by way of the social network analysis. What＇s more, the research explores the influence and the mechanism of public transport system on the recreational spots. Finally, the paper puts forward of countermeasures on the optimization of recreation space under public traffic system.The results show that：（1） Basically, the spatial accessibility of each recreational spot determines the time-distance accessibility of itself. Under the guidance of public transport system, the average timedistance accessibility of recreational spots is improved, especially, of which along the subway is advanced obviously. The public bicycle also plays a certain role.（2） The recreational resources endowment of recreational spots plays a decisive role to the distribution of recreational flow, but the public transport system compresses the time-distance accessibility and change recreational behavior, so as to enhance the distribution capacity of the recreational spots. As a result, the recreational space pattern is changed significantly, including the attraction and diffusion force of recreation spots to tourist flows, and the level of recreation spots.（3