Abstract: Ground pipeline pressure test of Guangxi Nanning–Liuzhou product oil pipeline project in the Honghe crossing section is taken as a case to analyze severe pressure fluctuations in the crossing section of oil and gas pipeline and other ground pressure test pipeline sections during the pressure stabilization period. Results indicate that the test pressure is largely affected by the temperature change of pressure test medium, mainly subject to ambient temperature. A computational formula for the relationship between temperature and pressure of ground pipeline is deduced respectively in the pure water pressure test and pure gas pressure test, and finally the law of the ambient temperature affecting the test pressure is analyzed. In view of difficult implementation of regulations on pressure test requirements and acceptance criteria inexisting national standards for acceptance criteria of crossing section and other ground pressure test pipeline sections, specific modification suggestions are proposed. In addition, a suggestion is also provided to the improvement of existing test methods.