Ultrasound鄄modulated electric machining system is analyzed through the method of dynamic analysis and then the dynamic properties of the vibrating tool with and without the load or not is discussed. Numerical simula鄄 tion results are compared with the theoretical calculated value, the results show that the higher precision could be ob鄄 tained while using the method of finite element analysis in the area of ultrasonic specialty. The rationality of the opti鄄 mization design for this system is verified by using the method of ANSYS parametric optimization design and optimizing the ultrasonic vibration system and the system processing test; the technical advantages of ultrasound鄄modulated elec鄄 trolytic machining in difficult鄄to鄄process materials and special鄄shaped surface processing are proved through micro鄄 structure ultrasonic compound electrolytic machining tests.