Degradation dynamics of Abamectin in different soils were studied by in cubation method.The result shows that soil organic matter,soil temperature and pesticide concentration can obvio usly affect Abamectin degradation,maybe which contributes to microorganism in soil.The dominant bacteria which can effect ively degrade Abamectin was isolated from experimental soil,and it was identified by 16SrDNA as Stenotrophomonas maltrophilia.After the inoculation of dominant bacteria into soil Abamectin degradation was further augmented.