More and more countries and organizations at home and abroad have issued relevant regulations and standards to quantify the discharge of industrial pollutants,among which valve leakage accounts for almost half of all pollutant sources.In order to better guide the technical requirements of valve leakage in natural gas industry,it is necessary to compare the related standards of valve fugitive emission (FE) and analyze the leakage point of the valve itself.The comparison mainly includes basic information (test object, test type, test medium, test method), tightness class, endurance class, temperature class.The results show that the test conditions and acceptance criteria are not the same among different standardsandvalve stem packingis the key to the control of valve external leakage.Among the currently available means of controlling fugitive emission from a valve, the use of leak-tight packing material is the most economical way.In the process of engineering design, reasonable FE class requirements should be put forward according to different working conditions and standard requirements.