The　pollution　soil　from　tar　workshop＇s　foundation　soil　in　a　steel　work,　first　of　all,　the　main　organic　pollutants　in　pollution　soil　are　examined　by　the　Pony　Test　Center.　Then,　the　volatility　of　the　pollution　soil　at　different　temperature　was　studied　by　thermo　gravimetric　(TG)　analysis　coupled　with　Fourier　transform　infrared　spectroscopy　(FTIR).　At　last,　by　adding　standard　reagents　of　PAHs　respectively,　their　volatility　of　different　temperature　period　was　confirmed.　The　results　indicated　that　the　main　organic　pollutants　in　the　contaminated　soil　were　fluorene,　acenaphthene,　phenanthrene,　fluoranthene,　pyrene　and　so　on,　the　total　content　is　about　156.39ppm.　the　weight　loss　of　pollution　soil　mainly　occurred　at　the　temperature　ranges　of　room　temperature　to　215　degrees　C,　215　similar　to　670　degrees　C　and　670　degrees　C　similar　to　850　degrees　C.　There　were　H2O　and　CO2　coupled　with　the　weight　loss.　When　temperature　increased　further　up　to　and　above　850　degrees　C,　the　weight　tended　to　be　stable.　The　volatilization　of　PAHs　is　mainly　in　the　section　of　215　similar　to　670　degrees　C,　and　their　fastest　volatilized　temperatures　in　pollution　soil　were　lower　about　30　degrees　C　than　their　respective　boiling　points.