Abstract: In this paper, the existing defects, acceptance criteria and feasible detection technology of the new oil gas pipeline are analyzed. The method of detection and evaluation named 22112 is proposed. A series of standards for checking the quality of the pipeline are established by the varying diameter before and after applying pressure to the pipe, the weak magnetism and magnetic flux leakage test. In order to improve safety of the pipeline, it is necessary to investigate and discover defects of pipeline timely and eliminate the potential and unacceptable risk or danger before running, meanwhile the handover of quality and construction of pipeline must be ensured.