Let nature take its course: it embodies the idea of "harmony between man and nature". It is emphasized that in the process of health preservation, we should not violate the laws of nature, but also pay attention to the unity and coordination between people and society. Just as Neijing said: "If you know astronomy above, geography below, and personnel in the middle, you can last forever". Double cultivation of body and mind: In the process of health preservation, we should not only pay attention to physical maintenance, but also pay attention to mental and psychological adjustment. The so-called "double cultivation of body and mind", "plastic surgery" and "concentration" are combined with activity: modern medicine advocates "life lies in exercise", while Chinese medicine also advocates "movement leads to yang", but also advocates "static by movement" and "not light work". Nursing according to the situation: health care is not limited to one method or style, and health care activities should be carried out in many ways, including body, mind, movement, quietness, food and medicine. In addition, according to different people, different places and different times, different health preservation methods should be adopted, which are called "keeping according to the time" and "keeping according to syndrome differentiation".