Abstract: Analyzed here in the paper is present situation concerning corrosion of the seamless linepipes as used for service in domestic gas and oil fields.Also described is the mechanism of corrosion by H₂S,CO₂ and the sulfate-reducing bacteria.Moreover the main corrosion-related issues concerning the linepipe as servicing the oil/gas fields are briefed.The ideas concerning design of the materials suitable for various corrosion-involved operation conditions are elaborated.And the comparative tests to the performances of the material under relevant operation conditions are conducted so as to verify the correctness of the design idea of the material.Finally the evaluations of the welding ability and the hot-bending property and the service status of the representative products are summarized,providing data support for relevant material- determination and engineering for the gas/oil fields.