运用模糊数学中的Euclid贴近度方法,分析了中国民航2005-2009年各航空公司在各季度的亿吨公里不安全事件发生率数据,确定出航空公司各季度发生不安全事件的贴近关系为相邻季度的不安全事件发生率贴近度最大,且有第四季度不安全事件发生率与第三季度最贴近,第一季度与上一年第四季度不安全事件发生率的贴近度次之,之后依次是第二季度与第一季度、第三季度与第二季度.随着贴近度的变小,各季度与相邻前一季度不安全事件发生率的可比性变差.%Implying the method of Euclid close-degree in fuzzy mathematics, the paper determines out the close-degree of the airlines' unsafe events in each quarter by analyzing the domestic occurrence of unsafe events per 100 million ton-km in four quarters from the year 2005-2009. From the result, we can conclude that the closestdegree is the quarters neighborhood, the unsafe occurrence of the forth quarter and the third quarter is the closest, successively is the first quarter and the forth in last year, the second quarter and the first quarter, the third quarter and the second one. As the close-degree becoming smaller, the comparability is growing worse.
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