Abstract: Described here in the paper is the probe arrangement method for detecting typical defects in the pipe manufacturing process as specified under applicable standard. And also proposed are the longitudinal flaw detection method,transversal flaw detection method,and serial detection method for steel pipe welds. Owing to verifying the sensitivity,coupling monitoring,and confirming the detection capability of different detection methods,the said detection methods are ensured to meet the requirements as specified under applicable standard for oil and gas pipelines. Combined with the automatic calibration mode,and comparing the corresponding waveform positions of the artificial scratch on the reference tube,the detection system is capable of clearly identifying the position error of the manually-measured defect,and any defect-missing and false alarm of the the reference tube,which brings convenience for the automatic detection of the steel pipe,and improves the inspection quality of the steel pipe.