A basophilic crude oil-degrading bacterium ODB04 was screened from crude oil-contaminated soil by enrichment cultivation. The strain ODB04 was identified as Klebsiella pneumoniae and its degradation capa- bility was evaluated. The oPtimal growth conditions for strain ODB04 were as follows:NaC1 concentration 1%~ 2% ,temperature 35 ℃ and pH value 8.0~9.0. The degradation rate of crude oil was 40% after incubation at 200 r · min i for 7 d under the optimal growth conditions and 56% with addition of 0.05% (volume fraction) non-ionic surfacta...