In view of the traditional Chinese medicine diagnosis depends on the experience on the skin contact between doctor and patient,the doctor may make accurate judgment sometimes because of their own or environmental interference.Based on the principle of photoelectric displacement method,a kind of pulse signal acquisition system using optical principle was developed.It can display oximetry pulse condition,and physiological information of measured object ot real time,realize the transmission and storage of information through the serial communication with the host,and provide reliable data for the doctor.