System and method of diagonizing blood pressure with a single photoplethysmography

Limb vascular diagnostic and accuracy increase feedback method using PPG according to an embodiment of the present invention is an optical flow meter (PPG: photo-plethysmography) blood pressure curve acquisition step of obtaining the blood pressure curve through (S100), the obtained blood pressure curve stiffness acquiring step (S200) the stiffness is (SI) are obtained from, by using the specific information of the patient, the value of the variable using the stiffness and the variable value variable value determining step (S300) and the measurement is determined, the first and a blood pressure first blood pressure calculation step (S400) is computed (BP