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The vigorously development of rail transportation promotes the integration of function,intensive three-dimensional development and convergence of people flow.Rail transit complex is the complex integrated of city rail traffic function into architectural space,that is to say,a building or a group of buildings combine with rail stations which are formed by a variety of different properties and different functions in the form of vertical stacking.The functional format and internal and external transportation should be rational organized so that we can effectively improve the utilization of various resources.Currently,most researches concerning the use of rail transit complex pay attention to the spatial form,only a few relates to the flow-path,of which most are case studies,lacking of systematic statement and related quantitative analysis.Therefore,our study analyzed and quantified the pedestrian flow-path and trying to solve the following two issues:1) What are the characteristics and regular rules of various flow-path selections in the rail commercial complex?2) How do the functional format,spatial layout,circulation organization and other factors affect the flow-path selection?For study of flow-path in commercial space of Capita Mall,a typical rail transit complex in Shanghai,we made a certain amount of investigations.The research is about the behavior characteristics,flow-path distribution and path selection during the period that from the time the consumer entering the complex from different entrances to the time they first purchasing or pre-shopping (such as inquiries,try,try to eat,etc).171 valid flow-path samples were obtained in two days,overall: (1) The flow-paths from the -2F and 1F which have the strongest importing flow capacity are most densely distributed.The remaining layers distributed more evenly.(2) One flow-path segment is of the greatest proportion,this category accounted for 70% (minimum),88% (maximum) in the four enter layers.The proportion of the two and three flow-path segments is between 15% and 30%.(3) From the point of how to choose path,the atrium and vertical transportation which are nearest to the entrance are used more often than others.According to our survey,there were five spatial factors affecting the total length of flow-path of consumer in rail transit complex: length of first flow-path,distance to primary vertical transportation,cross layer,function type of end point,relative depth.Then a multiple linear regression analysis was made which can explain 61.2% of the total length of flow-path in complex,while the other may be affected by unmentioned factors (such as time,individual factor,etc).The factors concerning flow-path are complicated and interactional.