Sun Simiao's contribution to health care is also outstanding. He closely combined health preservation with the prevention and treatment of senile diseases, and formed a set of materialistic theory of health preservation and longevity. He strongly criticized the fantasy of serving stones for immortality, and affirmed the scientific proposition that human life can be extended to 100 or even 200 years old, which is basically consistent with the modern prediction of human life. He believes that the main ways to live a long life are food, health care, physical exercise and personal hygiene. He emphasized the importance of dietotherapy to prolong life and prevent senile diseases, and advocated that dietotherapy should be used first, and then medication should be used after dietotherapy failed. Pay attention to the technique of massage guidance, advocate the combination of "static work" and "dynamic work" of Xiong Jing, and suggest that the elderly engage in some light manual labor that will not cause fatigue. It also emphasizes that people should not spit everywhere, eat unfamiliar, unclean and toxic food, eat too much, chew slowly, rinse their mouths and take a walk after meals, and don't open their mouths and cover their heads when sleeping. These subtle and specific requirements he put forward are in line with scientific principles. He used his extraordinary life span to prove that his theory of health preservation is not a lie, but a true interpretation.