Abstract: To study the cause and countermeasures of urban gas supply pipeline leakage accidents, the cause analysis was conducted to the explore accidents caused by leakage of coal gas, natural gas and liquefied petroleum gas supply pipeline around China, the physical and chemical properties of coal gas, natural gas and liquefied petroleum gas are described in detail, the accident feature, accident cause and gas supply pipeline transmission mode were analyzed, the dealing procedure, matters needing attention and personal protection requirement of urban gas supply pipeline were clarified, and countermeasures were put forward, to provide reference for each kinds of disposal team.

Key words: gas pipeline, leakage accident, explosion accident, emergency disposal