Abstract: A fully digitalized control strategy consisting of the outer loop of rotating speed regulation and the inner loop of current regulation for wire feed motor is proposed.Variable parameter control method is implemented according to different working procedures of the wire feed motor.The power circuit of wire feeder is composed of buck converter and full-bridge inverter, and the operation principles of the power circuit are analyzed.Also plug braking is taken to improve the dynamic response of the proposed power circuit, and double loop-closed block is established.The good dynamic and static performance of the wire feed system with this control strategy is verified by experimental results.