Abstract: Heart rate is closely related to cardiovascular disease, and it plays an important role in clinical diagnosis and routine detection. In this paper, we design a heart rate detection system by using the imaging photoplethysmography. It uses ordinary camera to collect face’s signal to analyze person's heart rate under natural light conditions. It uses ordinary camera to collect face’s signal firstly, takes the forehead as region of interest, then process images by Eulerian Video Magnification, gets mean value of gray images, gets the blood volume pulse, and gets the heart rate by changing signal into frequency finally. The system is easy to operate by using simple tools, and it can get person's heart rate quickly and accurately.