A new idea of artificial interference in the movement of weld pool after welding was put forward to im- prove the welding speed of stainless steel and restrain the hump weld bead and undercut defects． Compensating gas jet was introduced to impact the high temperature unsettled weld pool，and the weld formation was improved by in- terfering pulsed MIG weld pool of stainless steel． A self-made pulsed MIG weld pool compensating gas jet test plat- form was used to test different welding speeds and different compensating gas jet flow rates with 304 stainless steel as welding workpiece under the same energy input． The results show that the welding speed can be increased by more than 2 times with the method of compensating gas jet，and the welding seam is straight，uniform and beautiful without hump and undercut defects． The cross-section analysis of welding seam shows that the adjustment rate of liquid metal accumulated in hump by this method reaches 78. 63%，and the thermal efficiency of base metal increa- ses to 74. 36%．