Abstract: In order to investigate the concentration and constitution of polycyclic aromatic hydrocarbons(PAHs) in environmental air,the sampling method for 16 PAHs in air was optimized,and the PAHs in the air sampled from 5 representative public places(including panel testing room,teahouse,restaurant,crossroads and Karaoke compartment) in Kunming with the method were analyzed by GC/MS under selected ion monitoring(SIM) mode.The results showed that:1) it was preferable to collect PAHs in air with silica gel adsorbent for 120 minutes at the air flow rate of 1.0 L/minute;2) except for those from panel testing room,dibenzoa,hanthrene was not detectable in all samples;3) the places in the order of total content of PAHs in air were panel testing room>teahouse>restaurant>crossroads>Karaoke compartment;4) except for teahouse,the constitution and distribution of PAHs in environmental air in all tested places were similar,while the concentration of each PAH was different;5) the contents of acenaphthene,fluoranthene and pyrene in the air of teahouse were obviously higher than those in the other 4 places.