This paper introduced a cryotrap/purge and trap extraction with the GC- MS method for the determination of various trace amounts of alkyl thioether simultaneously.The cryotrap/purge and trap extraction technology was developed to extract trace amounts of alkyl thioether in the raw water.Some factors influencing extraction efficiency of purge and trap were optimized,including purging time,desorption time,purging temperature and purging salinity.The separation was performed on a CP-8564 column.GC- MS was used...