In optimal decision model : ( t ) nine main environmental impact indexes are summarized and qualmed from the main aspect of environmental impact of road construction based on the principles of comparability and measurability ; ? calculate each index with analytic hierarchy process , and introduce the concepts of educing matrix and absolute coincidence matrix to adjust judgment matrix in order to meet with satisfactory consistency ; ( 3 ) introduce the distance to calculate the weight of expert ; ? analyze the relationship coefficients with gray relationship method , then integrate the weights of indices and experts with them to obtain the compositor of ail of the schemes 在方案優(yōu)選模塊中:針對公路建設(shè)中環(huán)境影響評價滯后于公路建設(shè)的現(xiàn)象,將環(huán)境因素的影響提到設(shè)計(jì)階段,并對環(huán)境指標(biāo)進(jìn)行了重點(diǎn)分析,提出了用于比選的9個定量指標(biāo);采用層次分析法確定各級指標(biāo)的權(quán)重,并對判斷矩陣予以修正;引入距離測度的概念解決各專家的權(quán)值問題;運(yùn)用灰色關(guān)聯(lián)法分析各指標(biāo)的關(guān)聯(lián)系數(shù),并結(jié)合指標(biāo)權(quán)重、專家權(quán)重,最終得到各方案的關(guān)聯(lián)度優(yōu)劣排序。