Abstract: This paper summaries the welding methods currently used in oil and gas pipelines on production efficiency, welding quality, economy and availability scopes, compares common welding technologies of pipeline. The comparison results show that automatic gas-shielded arc welding has a bright potentiality, flux-cored wire semi-automatic welding is suitable to medium/small diameter pipelines with flexible and fast welding speed, especially low in the investment on welding equipments and manual electric arc welding will still be used in a long period.