With the increasing popularization of the urban buried gas pipeline, accidents as the fire and explosion and so on are occurred usually. Once the pipeline failed in operation, it can produce leakage serious consequence, and the consequence involves security of resident life and property loss, and affects the social stability, therefore the safe operation of urban buried gas pipeline is extremely important. The factors effected failure of pipeline are complicated, varied and fuzzy because of complicated underground environment in city, meanwhile, the factors caused failure consequence are uncertain because of various states on ground. Article takes risk study on buried gas pipeline in service as an example, the failure possibility and consequence of pipeline are expressed and evaluated with fuzzy language and comprehensive assessment method, and illustrated the risk grade of pipeline with risk matrix according to API, and obtained risk grades of element of pipeline, some measures are adopted to perfect integrality management, and to decrease the operation risk, and to ensure operation safely of the buried gas pipeline.
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