Aerosol samples for total suspended particles (TSP) at seven sites and seven kinds of aerosol source samples were collected from 2001 to 2002 in Chongqing. The concentrations of elements, organic carbon, element carbon, water-solubility ions of all particle samples were obtained by chemical analysis method. Source apportionment results derived from the chemical mass balance (CMB) indicated that the major contributors of TSP in Chongqing included: soil/road side dusts (30%), construction dusts (25%), soot dusts (18%), vehicle dusts (10%) and metallurgy dusts (8%), respectively. Moreover, comparison with the results of source apportionment in 1992 in Chongqing showed that major sources of TSP had changed from soot and metallurgy sources in 1992 to multi-pollution sources in 2002.