PM2.5, PM10 and PM > 10 chemical source profiles from China were investigated for key working processes of iron and steel plant. Four key working processes including sintering circuit, pelletizing process, blast furnace and converter process samples were collected via direct sampling method. Teflon and quartz filters were used in this study. The filter samples were submitted for both gravimetric and chemical analyses. Chemical analyses included X-ray fluorescence for elemental composition, ion chromatography for water soluble nitrate, sulfate and ammonium, and thermal/optical reflectance analysis for carbon species. The distribution of PM source profiles on the characteristic elements was different with each working process. Detailed chemical characteristics for different size fractions and working processes of iron and steel industry samples can be severed as a basic data for PM2.5 source apportionment.