Abstract: By adopting saturable inductor, an inverter-based arc welding power source with very good dynamic properties has been developed. Using the power source, the influence of dynamics properties on short-circuiting arc welding is evaluated in this paper, the results indicate that increasing the current falling speed at the later period of short-circuit will help to get fewer spatter, and increasing the current rising speed at the mid-period of the short-circuit will make the welding process more stability and regularity.