We investigated the decontamination technology of an oil-polluted soil,using the in situ bioremediation method.The demonstrative field experiment was carried out on a Typic Chernozem Sols at Valu lui Traian,Constanta County.The soil was polluted with crude oil up to 1% total petroleum hydrocarbons concentration in the first 10cm depth.The inoculum addition was considered as one of the most important technological link.Indigenous bacteria selected from Romanian soils polluted with very high oil quantities (up to 38% total petroleum hydrocarbons) were tested in laboratory for establish their hydrocarbon-degrading abilities.The most performing oil-degrading strains were used for inoculum elaboration.Moreover,tested bacteria selected just from the experimental oil-polluted soil were added in bacterial consortium.We considered that the strains belonging to specific studied soil could have a higher survival rate comparing with species isolated from other oil-polluted soils (because the differences concerning the soil types,and climatic conditions).The melioration measures company with inoculum added were:loosening for optimizing the ratio between the solid phase volume and that of lacuna space,ameliorative fertilization,both organic and mineral,aims firstly,raises the nitrogen content in soil in relation with the organic carbon (resulted from petroleum hydrocarbons),implicitly,the C:N ratio to an optimum level and the last technological link was soil conditioning with a high absorbtion capacity organic polymer.The first aim of this experiment was the removing of pollutants compounds,petroleum hydrocarbons respectively,and the second,the reducing the time period necessary for oil-polluted soil decontamination and melioration of its properties comparing with that existing former the pollution phenomenon.