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路线方案的择优是路线设计中的最根本问题，也是路线方案选择优劣的重要环节之一。在公路路线设计中，往往存在多个可行方案，如何从众多可行路线方案中选取最优方案，是设计的关键。集对分析理论是一种处理不确定性问题的系统分析方法，基于集对分析具有概念明确、计算简便和信息全面的优点，在集对分析同一度的基础上，建立了公路路线方案优选的集对分析模型。同时，运用变异系数法确定指标权重，提高了方案评价的可信度，为公路路线方案优选提供了一种简单、适用的评价方法。

Highway Route Scheme Optimization Model Based on Identical Degree of Set Pair Analysis

Scheme optimization of highway route is an essential problem in highway route design, and is also the important tache in scheme optimization. It often has several schemes during the design of highway route, and how to select the best is the key of the design. Set pair analysis is a systems analysis method of dealing with uncertain questions. It has many virtues, including specific concept, simple calculation and comprehensive information. The highway route scheme optimization model is built up based on the identical degree of set pair analysis. This paper uses the variation coefficient method to calculate the weight of indexes, improves the reliability of designing scheme evaluation, and introduces a simple and effective appraisal approach of highway route scheme optimization.