In this paper,we examined the arbuscular mycorrhizal fungi (AMF) colonization,oil concentrations,soil enzyme activities,soil factors and glomalin content associated with 13 tree species grown in oil contaminated soil in Yanchang of Shaanxi Province to discuss the effect of AMF on restoration of oil-contaminated soil.The results showed that,among the 13 species of trees,all of them were colonized by AMF with colonization 63.2%,and spore density 1.93 per gram dry soil in average.The highest colonization 91.6% and spore density 4.73 per gram dry soil were observed in Caragana korshinskii.The soil nutrient status in the rhizosphere of Populus tomentosa,Sophora viciifolia and Robinia pseudoacacia were better than that of others.With the increase in oil concentration,the polyphenol oxidase activities,catalase activities and glomalin improved.Higher polyphenol oxidase activities,catalas activities and glomalin were found in the rhizosphere of R.pseudoacacia,S.viciifolia and Ziziphus jujuba var.spinosa.Therefore,polyphenol oxidase activities,catalas activities and glomalin could be used as the sensitive indicators of oil contamination soils.