During　the　traditional　short-circuit　transition　process　metal　transfer　occurs　randomly,　the　time　ratio　of　short-circuit　to　arc　ranges,　and　energy　distribution　is　unstable.　Push-pull　feeder　CO2　welding　system,　which　maintaining　the　metal　drop　transiting　in　a　low　current　to　insure　the　CO2　short　circuit　transition　welding　steady,　is　controlled　by　the　push-pull　motion　together　with　waveform.　With　the　matching　parameters　determined,　pulling　out　the　wires　to　force　droplets　transfer,　has　declined　the　equivalent　arc　current　Iea　and　voltage　Uea　and　reduced　the　heat　input.　The　wires　system　in　a　similar　period　of　time　has　push　and　pull　motion　completed,　which　means　the　time　of　short-circuit　and　arc　is　similar,　and　the　energy　distribution　is　also　stable.　The　experimental　results　demonstrate　that,　a　certain　speed　has　improve　the　energy　much　more　efficient,　and　the　push-pull　feeder　CO2　welding　system　is　a　method　with　low　heat　input　and　effective　control.