Abstract: This article is to compare the two standards, the SY/T 4109—2005 “petroleum and natural gas steel pipeline non-destructive testing” and JB/T 4730—2005 “nondestructive testing of pressure equipments”. The comparisons are made as from the trans-illumination, IQI use, recognition system, film density, defect depth measuring method, defect assessment and the comprehensive evaluation. Some domestic experts on non-destructive testing and welding are invited to study SY/T 4109—2005 standard implementation and to make supplementary provisions for the standard, in view of the actual situation of the Sichuan to east gas transmission pipeline project. Through the SY/T 4109—2005 standard and supplementary provisions in the Sichuan to east gas transmission pipeline butt welding seam ray detecting in the practical application, this paper introduces the pipeline welding seam ray detecting practical experience and technical insights, highlights the SY/T 4109—2005 standard in long distance pipeline ray detection application practicability and maneuverability, and puts forward some suggestions for the improvement of the standards.