Abstract: Described here in the article are the process flow and the key inspection items of the pipe fitting for oil and gas transportation service.And analyzed are the requirements for the pipe fitting as specified under applicable National Standard and CNPC ordering terms,involving the process evaluation,the small-batch trial production,the first batch inspection and the sorting inspection.Some problems as currently met in pipe fitting inspection activities are summarized,and accordingly relevant proper suggestions are proposed,i.e.,based on actual need and the economic profit,the purchaser comprehensively prepare the technical agreement for the pipe fitting according to size,steel grade,purchase quantity,degree of production difficulty,and product maturity,etc.,and determine proper inspection items.