Some physical and chemical properties of the polluted soil on Nanyang oil field were investigated,and the influence of the physical and chemical factors on the micro-organisms was analyzed.In addition,strains which had stronger degrading capacity were screened from oil polluted soil through the method of enrichment culture,using petroleum as the sole carbon source.The result indicated that the pH index and water content of the soil on Nanyang oil field was comparatively beneficial for the degradation of pet...