Aiming at obtaining multi-wavelength fingertip photoelectric pulse wav e signals for pulse wave characteristic analysis,a pulse wave detection system based on an eight-wavele ngth laser modulated light source was designed using the STM32F103ZE embedded platform.The system light source is a modulated light source composed of an eight-wavelength laser controlled by STM32,and a photoelectric conversion circuit is formed by a photodiode to convert the optical signal into an easy-to-process electrical si gnal.The system combines the filter characteristics of Butterworth high-pass filter circuit and Chebyshev low-pass filter circuit to design a band-pass filter circuit composed of these two circuits in cascade to reduce the influence of noise on pulse wave detection,and used OrCAD PSpice software to optimize the circuit during circuit design,the f ilter circuit bandwidth choice 0.2~60Hz to retain the useful physiological information in the photoelectric p ulse wave to a larger limit.The eight- channel pulse wave data is collected by STM32using the time-sharing detection method,the detection result shows that the system has successfully detected the eight-channel photoelectric pulse wave and the pulse wave characteristics were clear,which reflected that the 0.2~60Hz bandpass filter circuit had a good processing effect on the photoelectric pulse wave.