An atmospheric particulate matter ( PM2. 5 ) and chemical elements of in Changping of Beijing were study in this paper. An innovative technology was appiled to monitor the concentration of PM2. 5 and chemical elements simultaneously, which could avoid the error of routine techniques. The pollution characteristics was analysised with heavy metals as pollutants tracer factor. The results revealed that with a mean mass concentration of 92 μg/m3 . Meanwhile, the test and source apportionment of heavy metals in PM2. 5 indicated that, Ca, Fe, K were abundantly enriched in PM2. 5 . The result of principal component analysis showed that chemical elements could been broken down into three categories:industrial and life fuel combustion, metallurgical industry waste gas and raise dust.%以北京昌平区某地大气PM2.5和重金属污染状况为研究对象，应用ß射线法与XRF技术相结合的分析技术，对PM2.5浓度和其重金属组分浓度进行同步监测，以重金属元素为污染物示踪因子进行污染特征分析。结果表明，监测期间该区域PM2.5平均质量浓度达92μg／m3，Ca、Fe、K元素含量较高。通过主成分分析该区域PM2.5元素影响因素主要为工业和生活燃料燃烧、冶金工业废气、扬尘3类，贡献比分别为52.42％、26.82％、13.10％。
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