Abstract: The influencing factor of short circuit transfer gas metal arc welding(GMAW) characteristic is analyzed according to waveform control parameters and a short current rising slope regulated multi slope waveform control method was put forw rand.The experiment result shows that the GMAW performance could be improved obviously when trimming the welding variables with the technological condition changed.By adjusting the short current rising slope and control period accurately the welding process was kept stable and fits for the different welding conditions much better.