Abstract: The paper involves a breifing concerning the current production situation, capacity,product-mix of domestic welded O. C. T. G. industry, and features and application scopes of different manufacture processes of O. C. T. G. The co-authors point out that it is necessary to upgrade the welding process for pipe formation of the existing spiral weld-oil pipe mills, instead of setting up aug more mill of that kind. In additiond It is proposed to set up a new production line for latgesized straight welded pipes, to speed up welded-oil casing mills' full capacity-aimed operation and spreading of the said mills as well as to further develop new welded O. C. T. G. and oil pipes made with other materials.