Abstract: A transdermal drug delivery(TDD) system based on low-frequency ultrasound is designed.TDD provides increased patient compliance and sustained delivery over prolonged time,and avoids hepatic first pass metabolism.The principle of instrument design,the structure of hardware,and the functions are presented.The role that SCM plays in the intelligent medical equipment is described.The system is safe and can increase delivery of drug based on parameters such as temperature,frequency and intensity.As a result it has practical values.