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The concept of the target reliability, technical connotation and significance of pipeline are interpreted in this paper based on the national and international research actuality, and the existing problems of pipeline failure consequence severity graded by a single factor is pointed out. The several important influence factors to gas pipeline target reliability are analyzed particularly. The assessment system based on the fuzzy mathematics theory is pointed out and the influence of these factors to the target probability of gas pipelines is assessed. The relation between the failure severity of pipelines and the gas pipeline target reliability is studied. The concrete confirming method of pipeline target reliability is established in this paper. Lastly, the quantificational research of oil-gas pipeline reliability on the basis of fuzzy mathematics theory is proved to be feasible through examples and is applicable in project, and could offer scientific foundation to the management and maintenance of gas pipeline.