This standard specifies the gas chromatography-mass spectrometry (GC-MS) analysis method for the seven main components of liquefied petroleum gas: propane, propylene, butane, 1-butene, isobutane, isobutylene and male-butene. It also specifies A gas chromatography-mass spectrometry (GC-MS) coupled analysis method for the main components such as methane in natural gas was developed. This standard is applicable to the qualitative analysis of the main components of liquefied petroleum gas and natural gas in biological samples (blood, liver, brain, lung, etc.).