7 strains degrading oil were isolated from long-term oil-contaminated soil and they were numbered as bacteria 2-1 ,bacteria 7-1 ,bacteria 1-2 ,bacteria5-2 ,bacteria 7-2 ,bacteria oil 3 ,bacteria oil 5 ,of which bacteria 2-1 and bacteria 7-1 were identified as Serratia marces-cens ,bacteria 1-2 as Raoultella planticola ,bacteria 5-2 ,bacteria oil 3 ,and bacteria oil 5 as Klebsiella genus ,bacteria 7-2 as Bacillus cereus by morphological observation ,Biolog identi-fication and 16S rDNA gene sequence analysis .Bacteria 1-2 ,bacteria 5-2 and bacteria 7-2 en-abled the surface tension of the fermentation liquid reduce from 36 .1 mN /m to 20 .2 mN /m ,20 .74 mN /m and 21 .78 mN/m ,indicating the surfactants produced by the bacteriums have a strong emulsification crude capacity and show great potential .