Abstract: Aerosol samples were collected over the Western Pacific Gcean during the second cruise of the TQGA Program. PIXE analytical method was used to determine elemental compositions of these marine aerosol samples. The results show that the heavy metal elements in aerosol are found to be much lower than that of aerosol collected on continent. however, relatively higher concentrations of Fe, Cu, Zn, Si are observed in the samrles collected near the continent. Season trend is apparent in the total concentration of the measured elements, with higher concentration being observed in spring than in autumn.