目的 针对现场经常提取到的快递塑料包装袋物证，建立一种快速检验分析、样本分类的方法。方法 采用X射线荧光光谱法对41个不同快递公司、不同来源地的快递塑料包装袋样品进行无机元素检验分析。根据不同样品的元素种类含量进行分类，并利用系统聚类和K-Means聚类，对样品进行聚类分析。结果 根据检验得出无机元素含量及其主要元素的比值，对各样品进行有效区分。通过系统聚类的方法，将样品成功聚为4类。用K-Mean算法对聚类结果进行检验，其分组结果基本一致，说明该方法的聚类效果良好。结论 利用X射线荧光光谱法结合聚类分析检验41个样品，结果表明，各类样品特征明显，具有较高的区分度，可以实现对不同公司、不同来源地的快递塑料包装袋进行区分。文中方法为公安工作中处理此类物证提供了一定的理论参考。

For the courier plastic packaging bag evidence that often be extracted on the site, a method for rapid test analysis and sample classification was established. The inorganic elements in 41 samples of express plastic packaging bags from different express companies and different origins were analyzed by X-ray fluorescence spectrometry. The samples were classified according to the element contents of different samples, and the clustering analysis was carried out by using the hierarchical clusterand K-MEANS clustering. The samples were effectively distinguished from each other based on the inorganic element contents and their ratios of major elements derived from the tests. The samples were successfully clustered into 4 categories by hierarchical cluster method. The clustering results were examined by the K-Mean algorithm, and their grouping results were basically consistent, indicating that the clustering effect of the method was good. Using X-ray fluorescence spectrometry combined with cluster analysis to examine 41 samples, the results showed that the characteristics of various types of samples were obvious, with a high degree of differentiation, and could be achieved for different companies, different sources of express plastic packaging bags to distinguish. The method in the paper provided a certain theoretical reference for dealing with such physical evidence in public security work.