In Luojiazai Gas Field development, the construction unit provides a list of welding materials for high sour gas field surface construction and carries out a study on welding technology and corrosion evaluation technology for such carbon steel pipes and forgings as 20#Ⅲ , 16 Mn Ⅲ , L 360 QS, L 360 MS, L 245 NS and A 105 N and fruitful achievements and a lot of knowledge have been achieved. These achievements are widely used in surface construction of Longgang Gas Field and other similar gas fields successively and the construction pace of these gas fields is speeded up accordingly. In combination with the experience from domestic high sour gas fields under development and construction and the experience of welding pipelines in acid environments from international well known oil companies, conducted is analysis on the welding procedure qualification of gas gathering trunk line (butt welds of L 360 QS φ 508 mm × 14.2 mm seamless steel pipes) in Luojiazai Gas Field development and analysis results will provide valuable reference for similar gas field development in the future.