This Standard specifies the terms and definitions, technical requirements, test method, inspection rules, instructions, marking, packaging, transport and storage of gas leakage alarm device of gas vehicle. This Standard applies to gas fuel (NG, PG) leakage alarm device using the point type gas concentration testing principle, which is installed and used in single-fuel, bi-fuel and dual-fuel gas vehicle, and oil-gas and gas-electric hybrid vehicle. This Standard can be referred to for leakage vehicle of other types of gas fuels.