High service performance equipment with lager wall thickness,multi structure and high service environment is widely applied in the field of marine equipment and national defense.Arc welding is a common welding method for these structures, while the characteristics of slow welding efficiency, large heat input and deformation limit its development prospect. At present,high energy beam laser is widely used in welding of thick wall components. The performance feature and development status of high-power laser device were introduced. The current laser welding technologies of high-power laser autogenously welding,laserMIG hybrid welding and narrow gap laser wire feeding welding and their application conditions were analyzed.Among them,narrow gap laser wire feeding welding has the advantages of large weldability thickness,strong adaptability and small deformation,which is considered as one of the suitable welding methods for thick wall components. The key techniques of all-position narrow gap laser wire feeding welding were emphatically introduced. Finally,the develop-ment potential of laser welding on the manufacturing field of lager thick-wall component was summarized and expected.