Abstract: By adopting the positive defocusing amount, the effect of fiber laser-metal inert-gas welding(MIG) hybrid welding parameters on the weld morphology of 304 stainless steel, mainly including wire feeding speed, arc length, laser power, the distance between laser and MIG arc, welding direction and butt joint, was studied through many welding experiments. Results indicate that the good welding effects can be obtained by matching proper wire feeding speed and arc length when the extension length is 15mm and the distance between laser and MIG is 2mm. The results also show that small diameter wire will help to make the narrow weld width and low weld reinforcement, end tab will solve the problem of bad welding morphology at welding initial position. A conclusion is drawn that good welding quality of 304 stainless steel can be achieved when the proper welding procedure of laser-MIG hybrid welding is adopted.