Abstract: Improving China's present design and pressure-testing standards of natural gas pipelines, combinedwith high-strength hydraulic tests, not only the outputs of the pipelines can be increased, but also the wholelevel of pipeline construction can be improved, so that the natural gas pipelines can be operated under saferand more economic conditions.In the paper, relevant items of China's National Codes are compared withthat of American Codes and analysis on output increment and safer margin, which can be obtained afterimproving the present design standards and using high-strength hydraulic tests, are also carried out andsuggestions for emending relevant items are provided.