Abstract: Briefed here in the paper are the general situation of the offshore petroleum industry of the world,the importance of the very industry as well as the development of China's offshore petroleum industry. Also investigated are the demand of offshore oil pipes by the offshore petroleum industry in the country. A detail comparative analysis of the technical requirements for the offshore linepipes is made,based on which relevant issues that have to be taken care of are proposed. At last,the domestic demand for such pipes in the future is roughly forecast.