From ancient times to the present, we are all looking for a secret of longevity and a method of health preservation. Since ancient times, why does the human body age? What is the secret of longevity? Kong Bohua's twelve-character formula for health preservation systematically expounds health preservation according to the theory of traditional Chinese medicine and the characteristics of Confucius' medicine, which enables us to deeply learn the "three-four-five" balanced health preservation method integrating exercise, diet, culture and natural therapy.