Abstract：Research purposes: In recent years，many roads have been built in coteau in China． Freeway construction affects the environment seriously． This paper discusses the relation between the transect arrangement of the coteau freeway and environment to reduce the influence of coteau freeway construction on the ecological environment．
Research conclusions: When the freeway is needed to be constructed in coteau，it is necessary to do the research on the coordinated relation between the freeway construction in coteau and ecological environment． This paper analyzes the relation between transect arrangement of coteau freeway and ecological environment． The evaluation model is established with the objective and subjective synthetic approaches to determine the weights integrating the environment，society and economy factors for choosing the transect arrangement plan which benefits environment protection and economy to reduce the influence of the freeway construction in coteau on the ecological environment．
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Wu Huajin． Choosing and Studying the Form of Subgrade Section of Expressways in the Mountainous Terrain［J］． Yunnan Communication Science and Technology，2002( 2) : 17 － 21．
Xu Jijiang，Zhong Yiming，Yang Dengfa． Selection on Economical Section Type of the High Fill Roadbed in the Mountainous Area［J］． Journal of Chongqing Jiaotong University，2005( 1) : 85 － 88．
［8］ 杨采侠． 生态公路设计理念与实现研究［D］． 西安: 长安大学，2004．
Yang Caixia． Design of Ecological Highway and Realizability Study［D］． Xi’an: Chang’an University，2004．
Fan Zhiping，Zhao Xuan． An Objective and Subjective Synthetic Approach to Determine Weights in the Multi －attribute Decision Making［J］． Decision Making and Decision Support Systems，1997( 4) : 87 － 91．
Zhao Wenyan． Research on the Degree of Side Slope of Mountainous Highway Based on Ecological Environment ［J］． Journal of Railway Engineering Society，2008( 7) :10 － 13．
2011, Vol. 28 
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