Abstract: Along with the development of domestic oil-field drilling technologies, considerable progresses have been made in domestic O. C. T. G.,industry in terms of capacity,technology,product quality and equipment technical level. However,the country's demand in this field can not be yet completely met by domestic capacity,due to critical requirements for O. C. T. G.,in addition to T. G. production, the development orientation of domestic O. C. T. G. industry is proposed.