Increasing requirement of MCMnFe & MCCrFe in steel enterprises, the applying of the shaking ladle process is also adapted by more and more ferroalloy enterprises. Changing the speed of rotation, the phenomenon of the oil/-water interface motion is investigated by simulation test under the different eccentric distance, volume ration of oil to water, and speed of rotation. The results show that with the same ladle diameter and eccentric distance, and the increase of the speed of rotation, the state of Oil/Water interface motion is changed from oscillatory motion to lotus-leaf state motion, and finally the emulsifying state motion. Among the three states, the emulsification state is the required movement with the full agitation and fast mass transfer speed. The more the eccentric distance and the less Voil/Vwater, the less the critical speed of rotation is, and vice versa.