Abstract: The ateel pipelines buried in soil expose to extremely electochemical corrosion. As soil is asymetric and nonisotropic eloctrolyte, it can form various corrosion cells which make steel ltself suffer corrosion.The corrosive cells formed in non-isotropic soil are characterized by their intenso corrosive nature, and so the like zone zhould be kept away as much as possible in survey and design. To deal with corrosion at weld joint, shielded inert gas are will be used and the insulation grade raised. Electric protecting will get into effect to keep pipelines in the optimum protected state.