A gas chromatography-mass spectrometry(GC-MS) with solid phase microextraction(SPME) was developed for the determination of 18 polycyclic aromatic hydrocarbons(PAHs) migrated from asphalt based waterproof coating.Influences of fibers species,extraction time,mixing speed and temperature on extraction efficiency were investigated.Under the optimized experimental conditions,good linearities were obtained for 18 PAHs in the range of 1-100 μg/L with their correlation coefficients(r) of 0992 8-0998 9 and the detection limits of 003-009 μg/L.The average recoveries at three spiked levels of 1,10,100 μg/L were in the range of 71%-94% with the relative standard deviations(RSD,n=6) of 28%-86%.The proposed method was applied in the migration analysis on five asphalt based waterproof coatings.Results showed that the PAHs in migratory fluid were detected,in which most were those with 4 rings below.The method is suitable for the determination of 18 PAHs migrated from asphalt based waterproof coating.