Objective Observe the normal reference values of photoelectric blood stream plethysmogram indexes of health adults' complexions and observe ratio indexes of blood stream plethysmogram of three kinds of colours. Methods By matching GD-3 photoelectric blood stream plethysmograph and Pclab biology enginery system, we observed indexes of blood stream plethysmogram of forehead, left-cheek, right-cheek, nose and mandible, and indexes of blood stream plethysmogram of three kinds of colours. Result In the five positions, indexes of time reflecting heart pulsation (Tag, Tab, Tae, Teg, Tab/Tag, Tbe/Tab)...