Abstract：Research purposes:In the planning stage of urban rail transit network，the initial track laying scheme should be determined for providing the reference to the follow － up track design． This paper summarizes and analyzes the regional situation，planning，topography，geology，distribution of cultural relics and road width of Xi＇an，presents the main control factors on the track laying in different areas and puts forward the position scale of laying track in the transition section of Xi＇an urban rail transit network for better controlling the project cost and reducing the impact on environment．
Research conclusions:In the process of network planning，the decision on the laying mode of the urban rail transit＇s track，especially the track located in the peripheral regions，should be deeply researched according to the plan，the current situation and implementation conditions． The positions of building the transition section of Xi ＇an rail transit should be as follows: In the east city，the transition section should be built near the Chanhe River，in the south city，the transition section should be built in the south area to the Hantian Avenue and the West Avenue，in the west city，the transition section should be built in west area to the Third Ring Road，and in the north city，the transition section should be built in the area to Zhengzhou － Xi＇an High － speed Railway．
Li Tuanshe．Relationship between the Elevatde Laying Mode of Urban Rail Transit Lines and City Development［J］． Urban Rapid Rail Transit，2010 ( 3) : 53 － 55．
Chang＇an University，China Railway First Survey and Design Institute Group Ltd，Xi’an City Planning and Design Institute． Xi ’an Urban Rapid Rail Transit Network Planning Modification [Z]． Xi’an : Chang’an University，China Railway First Survey and Design Institute Group Ltd，Xi’an City Planning and Design Institute ，2011．
2012, Vol. 29 
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