Abstract：Research purposes: The construction of railway watershed tunnel is a tough work with several schemes for selection and it is crucial to the railway alignment，construction investment and construction security． As in the watershed section，the track elevation is high，the tunnel is deep buried and the topographical and geological conditions are complicated，only adoption of the regional mapping and boring in large area is difficult to clearly know the geological conditions． How to scientifically and seasonably bring the geophysical prospecting into play in the route selection of railway watershed tunnel is the question facing to the railway prospector． Taking the geological prospecting for the watershed tunnel of Jining － Tonghua Railway as an example，this paper studies the role of geophysical prospecting in the route selection of railway tunnel．
Research conclusions: By using the geophysical prospecting，the unfavorable geological structure of fault，the lithologic delimitation and the development of underground water can be clearly found out and it can provide the basis for grading the surrounding rock of the tunnel． The scientific arrangement of boring and reduction of boring quantities can much cut the prospecting cost，shorten the prospecting period and enhance the survey quality． So the geophysical prospecting can play great role in the route selection of the watershed tunnel．
Hao Ming，Dong Chen，Influence of MT With Source and without Source in Long and Big Turnners with Basalt Buried ［J］． Chinese Journal of Engineering Geophysics，2009( S1) : 46 － 48．
Li Zhihua，Zhu Xudong． The Application of Integrated Geophysical Exploration Technology in the Tunnel Under the Complicated Geological Conditions ［J］． Journal of Railway Engineering Society，2008 ( 8) : 58 － 61．
［3］ 郝明，董晨． 牡绥线初测综合物探［J］． 铁道勘察，2008 ( 6) : 67 －71．
Hao Ming， Dong Chen． Integrated Geophysical Prospecting for Preliminary Surveying of Mudanjiang － Suifenhe Railway ［J］． Railway Investigation and Surveying，2008( 6) : 67 － 71．
Zhou Haibin，Li Zhihua，Technical Research on the Seismic Reflection in Coal Seam Gob under Difficult Terrain Condition［J］． Journal of Railway Engineering Society，2010( 2) : 18 － 21．
Hao Ming，Li Wei，Guo Zhiqiang． Physical Prospecting Used to Test the Quality of Retaining Walls in Roadebed Project［J］． Progress in Geophysics，2003 ( 3 ) : 440 － 444．
Hao Ming，Xu Guangchun，Guo Zhiqiang． Research and Practice of Railway Geophysical Exploration in Cold area［J］． Journal of Railway Engineering Society， 2010( 10) : 15 － 19．
2011, Vol. 28 
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