Abstract: 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.