As the Mist jetting electric discharge milling is lack of discharging stability, an ultrasonic atomizer,
which generates micro fog drops, is applied on the machining. And with supersonic vibrator, which offers vibration to
work piece,a better performance can be obtained. Experiments on electric discharge milling with mist generated by
tap water and deionized water were conducted. The results showed that the micro fog drops attained by ultrasonic at
omizer could effectively reduce the short circuit rate. Further, the experiments also illustrated that mist jetting from
external side could further improve the stability of the milling and achieve a better performance.