Abstract: In addition to the elemental analyses,both TOF-ICP-MS and HR(CP-S were applied to the determination of lead isotope abundance ratio for atmospheric aerosol samples collected in Beijing during the winter of 1998-1999. The results indicate that ICP-MS analysitcal data can be used for the investigation of lead pollution sources. The concentrations of some characteristic elements such as bromine, titanium and lead varied systematically with lead isotope abundance ratios. Samples with higher lead content have higher contirbuiton from leaded-gasoline, while those with lower lead content have higher contribution from soil dust and coal fly ash. Some aerosol samples showed a feature of long-distance transport from Siberia. Taking meteorological conditions into account , a reasonable explanation is presented for the four aerosol sample groups obtained from cluster analysis. It is feasible to apply the lead isotope ratio as a fingerprint technique to the source study of lead pollution in Beiing.