Abstract: Developed a new kind of electronic inductor controlled inverter arc welding power source.At the beginning of the short circuit,the output current could be kept at a low level,then it will rise at a high speed at first and a lower speed a short time later,in which the rising speed of short circuit current could be adjusted.During the arc period,changing rate of arc current could be adjusted by modulating the parameter of the control circuit,which ensures the output power of the arc is big enough.Some special circuits are used to improve the welding process at the arc beginning and the ending.It is proved that the low spatter,good weld bead,easy ignition,no ball on the top of wire is the characteristic of this kind of inverter power source.