Abstract：Research purposes: Intercity railways not only can meet the demands of the regional economy development，but also provide the big power to the regional integration． When and whether to construct intercity railway relate to its economic benefits and the social benefits along the line． But now a little research has been done on it，so it can not better guide the management，construction and operation of intercity railway． In this paper，based on the theoretical analysis of much data，the model for the traffic income and expenditure balance of intercity railway is established by using financial analysis to explore the construction condition of passenger flow density for constructing intercity railway and the research is done on the construction condition of the intercity railways in east，middle and west regions of China．
Research conclusions: The construction condition of intercity railway should fully consider the influence of the difference in social and economic fields among the east，middle and west regions of China on the transportation demand，and the different construction conditions should be defined for the different regions． From the analysis with the model，it is concluded in east region，the construction condition of the intercity railway is the density of passenger flow will be up to 16 million person km / km in the near future，in the middle region，the density of the passenger flow will be up to 12 million person km / km and in the west region，the density of the passenger flow will be up to 10 million person km / km．
Wu Qigang，Yang Jianjun，Gao Mingming． Researches on the Admission and Sequential Decision － making Model for Intercity Railroad Construction，2009 ( 10 ) : 102 － 105．
［3］ 林琳，蔡伟新，刘建军． 工程财务分析与评价［M］． 武汉: 武汉理工出版社，2009．
Lin Lin， Cai Weixin， Liu Jianjun． Engineering Financial Analysis and Evaluation ［M］． Wuhan: Wuhan University of Technology Press，2009．
［4］ 铁路建设项目经济评价方法与参数及案例实务全书［M］． 北京: 中国建设出版社，2006．
Economic Evaluation Methods and Parameters of Railway Construction Projects and Practice Study［M］． Beijing: China Construction Press，2006．
2011, Vol. 28 
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