In order to clarify the mechanism of ultrasound inhibition of dendritic ice growth,the effect of ultrasonic waves on the growth of dendritic ice in degassed sucrose solutions and untreated solutions were investigated.A novel ultrasonic cold stage device was applied in the detection.The results show that ultrasound could inhibit the growth of dendritic ice in both untreated and degassed sucrose solution.But the growth velocity of dendritic ice in untreated sucrose solution is much less than that in degassed solution.It is concluded that cavitation is the major factor for the inhibition of dendritic ice growth.