中文摘要：

本文利用固相微萃取（SPME）的高富集性和气相色谱-质谱（GC-MS）的精确性，采用SPME／GGMS方法对模拟纵火现场中的常见火灾残留物进行分析，并通过比较其特性化合物，很大程度上提高了判断的准确性。利用二甲基苯、三甲基苯、四甲基苯及甲基萘类化舍物各自异构体的特征比值，可以很好地减少分析过程中背景干扰。通过向量夹角法进行相似度分析可以帮助判断干扰物的影响。

英文摘要：

For the high enrichment of Solid Phase Micro-extraction （SPME） and the high precision of Gas Chromatography/ Mass Spectrometry, SPME/GC-MS was used in the analysis of some common fire debris that was taken from a simulated arson scene. The presence of gasoline can be identified accurately by comparing some target compounds. With the help of the diag- nostic ratio of the area of 2-Methylbenzene,3-Methylbenzene, 4-Methylbenzene, Methylnaphthalene and their relevant isomers, the interference of background in analysis can be reduced. The Similarity Analysis by vectorial angel method showed the effect of interference matrices.