Abstract：Research purposes: For construction of the new － type system bridge，the analysis and research should be done on the structural system pattern before the construction and the construction plan should be optimized according to the characteristics of the bridge construction． Based on the cable － stayed and self － anchored suspension of the Hanzhong Second Ring Road，the analysis and study were done on the structure features of the new composite structure and the optimization process．
Research conclusions: By research and optimization of the construction plan， the requirements of the construction safety，rationality and operability were met to make the construction going ahead smoothly and safely． For construction of new －type bridge structure，it was necessary to analyze the characteristics of the bridge structure and optimize the construction plan before construction． The characteristics of the bridge structure could be better understood by doing research on the optimization of the construction plan before construction． In this way，the construction could be finished safely and reliably．
李海燕. 斜拉－ 自锚式悬索组合体系的体系转换优化[J]. 铁道工程学报, 2012, 29(7): 33-35.
LI Hai － yan. Optimization of System Transformation of Cable － stayed and Self － anchored Suspension Compound System. 铁道工程学报, 2012, 29(7): 33-35.
Liu Qiong， Huang Caiping， Dang Zhijie， etc．Experimental Research on the Load Carrying Performance of Steel – concrete Junction in Box Girder of Cable － stayed Bridge［J］ ． Journal of Railway Engineering Society，2009( 9) : 46 － 49．
Ke Hongjun． Determination and Implementation of Construction Method for System Transformation of Liede Bridge in Guangzhou［J］ ． Bridge Construction，2010( 2) : 80 － 83．
Fan Guohua，Liu Fuqiang． Discussion on the Inner Force Detection of be am with Stress Relief Method［J］．Journal of Waterway and Harbour，2006 ( 4 ) : 263 －264．
［4］ JTG/T F50—2011，公路桥涵施工技术规范［S］．
JTG/T F50—2011， Technical Specification forConstruction of Highway Bridge and Culvert［S］
2012, Vol. 29 
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