Abstract：Research purposes: The appropriate comprehensive approaches should be adopted to the super big bridge in the area with the complex geological and topographical conditions． Taking a super big railway bridge in the Southwest China as an example，this paper analyzes and compares the various geological survey approaches and their effects and offers the knowledges on ensuring the survey precision for the super big bridge in the area with the complex geological condition．
Research conclusions: Under the complex geological and topographical conditions，the geological investigation for the super big bridge should be conducted according to the existing norms and based on the geologic mapping． The variety of survey means should be used to complement and validate each other． By makin the comprehensive analysis，the development characteristics of the rock － soil layer and structure can be judged，the geotechnical parameters can be determined and the site and foundation programmes can be evaluated．
陈 伟. 西南某铁路特大桥综合勘察认识[J]. 铁道工程学报, 2011, 28(12): 49-53.
CHEN Wei. Knowledge on Comprehensive Survey for A Super Big Railway Bridge in Southwest China. 铁道工程学报, 2011, 28(12): 49-53.
Yang Changyi． Analysis of Concealed Fracture Zone’s Impact on Selection of Heihe Bridge Site［J］． Journal of Railway Engineering Society，2010( S) : 152 － 157．
Wang Guoxin，Li Dong． Knowledge on the Survey for Liaoyewan Major Bridge of Suining － Chongqing Railway［J］． Journal of Railway Engineering Society， 2009( 12) : 20 － 24．
2011, Vol. 28 
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