The　waveform　control　project　is　the　key　of　realizing　better　control　for　CO2　short-circuiting　welding.　For　the　shortage　of　extension　adaptability　for　constant-current　waveform　control　project　and　the　higher　probability　of　transient　short　circuit　occurring　due　to　the　bigger　repulsion　effect　of　droplet　in　arcing　evening　for　constant-voltage　waveform　control　project,　a　new　waveform　control　method,　NWC　(natural　waveform　control),　is　brought　forward.　In　order　to　reduce　the　repulsion　effect　of　the　droplet　and　realize　the　natural　short　circuiting　transfer,　the　method　not　only　adopts　slope　control　mode　in　arc　period　and　short-circuiting　period,　but　also　can　automatically　module　waveform　control　parameters　with　the　time　and　space　information　for　short　circuit　welding.　The　experiment　results　validate　the　NWC　project　has　the　characteristics　of　improving　the　natural　short　circuit　transfer,　good　regular　waveform　control　effect　and　better　arc　stability.