Abstract: Some influential factors in laser-MAG hybrid welding process were analyzed.By the analyzing device of welding arc,it was found that when the distance between laser spot and wire tip is 1 mm,the penetration of hybrid welding increase to 1.5 times which compared with conventional MAG welding,and hybrid welding can also improve spreadability,increase weld width,reduce undercut and so on.Hybrid welding,as laser welding,gets the maximal penetration,when laser focus was located 1 mm below the top surface of the plate.