Abstract: To improve precision in road traffic safety macroscopic evaluation，the relativity among the chosen evaluation indexes should be avoid；and to avoid the subjectivity,the impersonal weight as the importance of diferent indexes should be done．The paper discussed that it regarded Conlnlon factor in factor analysis method as replaced indexes and the scored value as the new indexes’values．So the new index weights were calculated according to the explained extent of original evaluation data．Then objective evaluation was done with linear weight method to what we would evaluate．At last，we made a contrast with other methods and studied the application,and discovered different conclusion compared with other methods．

Key words: road safety evaluation, factor analysis method, objective weight

摘要： 探讨了用因子分析法中公因子作为评价指标的替代指标，用其得分值作为新指标的数值．根据公因子对原始评价信息解释大小来计算新指标权重．然后，用线性加权法对评价对象的安全水平进行客观评价，最后，对此方法进行了比较应用研究，发现评价结论与其它方法有差别．

关键词: 道路安全评价, 因子分析法, 客观权重