Abstract: The transportation of gas by pipeline is one of the safest transportation ways for energy transportation, while the most important work for operator to do is to maintain safe operation of gas pipeline.In the light of pipeline accidents occured in Russia, Europe and the U.S.A.during 70's-early 90's, an accidental analysis has been carried out, with the aim of full understanding the accidents and accidental causes as to provide a referential experience for the daily operation management, mornitoring, accident diagnosis, accident control and prevention of actual gas pipeline.