The pipeline explosion produces the damage effect,and the air shock wave will cause damage to the surrounding buildings.In some cases,the limited space of gas explosion is equivalent to the rationality of the TNT equivalent,and the corresponding numerical simulation model was established based on AUTODYN.It provides a new train of thought to buried pipeline explosion simulation.It Uses the established model to analysis the pipeline failure process under explosion load,damage rule and the attenuation law of explosion wave in the air of different buried depth and different wall thickness to establish a comprehensive index system of urban underground pipeline risk assessment and determine the safety standard to provide the reference.Get the following conclusion: TNT equivalent weight method used for buried pipeline explosion numerical simulation is a feasible method.Basing on the analysis results can effectively simulate the buried pipeline blast damage consequences; With the increase of buried depth,formation damage in the air damage range smaller,every 0.1m increase of buried depth,its air ultra reduce 4.5%-5.1%; Every increase of pipe wall thickness 5mm,its air ultra reduce 8.3%-12.1%.