Abstract: Five original KOSA soils,collected in the locations of being thought to be the origins of KOSA aerosol in China,were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) to determine the lead isotope ratios ²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb.Tominimize mass bias and drift in Pb isotope measurement,the mass discrimination correction,based upon the addition of thallium to the samples and measurement of ²⁰⁵Tl/²⁰³Tl ratio,was used.At the same the, concentrations of 12 elments were determined as a function of particle-size by ICP-MS and induedvely coupled plasma atomic emission spectrometry (ICP-AES).