Short　circuit　droplet　transfer　control　system　was　developed　on　the　basis　of　single　chip　computer　controlled　inverter　power　supply,　and　a　proper　wave　form　control　method　was　designed.　The　effects　of　different　wave　form　control　parameters　on　short　circuit　droplet　transfer　were　studied　by　orthogonal　experimental　design　and　analysis　of　variance.　Parameters　were　optimized　on　the　basis　of　orthogonal　experimental　design　and　a　stable　short　circuit　droplet　transfer　and　nice　weld　bead　was　obtained.　The　results　prove　that　current　rise　speed　on　the　beginning　of　short　circuit　and　current　falling　speed　during　arc　period　have　great　effects　on　the　stability　of　short　circuit　procedure.　Current　rise　speed　on　the　later　period　of　short　circuit　has　bigger　effect　on　average　time　of　arc　period,　and　little　effect　on　the　stability　of　the　period　of　short　circuit.