lifelines provide the vital utilities for human being in the modern life. they convey a great variety of products in order to meet the general needs. Also, buried continuous pipelines pipelines are generally used to transmit energy sources,such as natural gas and crude oil. from production sources to target places. To be able to sustain this energy corridor efficiently and safely, interruption of the flow should be prevented as much as possible. This can be achieved providing target reliability index standing for the desired for the earthquake threats to buried continuous pipelines is the primary concern of this thesis in terms of reliability. Operating loads due to internal pressure and temperature changes are also discussed.