Acupuncture and moxibustion can harmonize qi and blood, balance yin and yang, and then replenish deficiency and diarrhea, and comprehensively adjust the function of viscera. Acupuncture can improve the functions of various systems of human body, improve the disease resistance of human body, thus contributing to the rehabilitation of diseases, which is of great significance to health care. Qi and blood are the material basis of human life activities, which are spread all over the body by the conduction of meridians, and play the role of promoting, warming, gasifying, consolidating and nourishing. Only when the channels and collaterals are unblocked and the qi and blood are harmonious can the zang-fu organs function normally and the body be peaceful and peaceful. Through certain acupuncture techniques and appropriate stimulation of acupoints, blocked meridians can be unblocked and their normal physiological functions can be exerted, so as to achieve the purpose of prolonging life. Dredging meridians and harmonizing qi and blood is the mechanism of acupuncture and moxibustion for health preservation. The balance of yin and yang is the physiological state of healthy people, and the purpose of acupuncture is to adjust and maintain this state. The function of acupuncture in balancing yin and yang and coordinating viscera is basically accomplished through the yin and yang properties of meridians, the coordination of meridians and acupoints and acupuncture techniques. Acupuncture practice shows that some acupuncture methods can benefit lung qi and nourish lung yin by acting on the lung meridian of hand Taiyin. Acting on the large intestine meridian of hand Yangming, it can ventilate and help conduction; Acting on the stomach meridian of foot Yangming, regulating stomach qi and nourishing stomach yin; Acting on the spleen meridian of foot Taiyin can strengthen spleen and strengthen yang; Acting on the heart meridian of insufficient yin can benefit the heart qi, nourish the heart yin and benefit the heart yang; Acting on the small intestine meridian of the hand sun can clear the small intestine; Acting on the bladder meridian of foot sun can help gasification and benefit waterways; Acting on the kidney meridian of yin deficiency can nourish kidney yin, strengthen kidney yang and tonify kidney qi; Acting on the pericardium meridian of hand jueyin can protect the mind and benefit the blood vessels; Acting on the meridians of the triple energizer of shaoyang in the hand can make the triple energizer smooth, promote the gasification of triple energizer and nourish the five internal organs. Acting on the gallbladder meridian of foot shaoyang can clear the gallbladder and benefit the fu-organs; Acting on the liver meridian of Foot Jueyin can soothe the liver and regulate qi, replenish liver blood, nourish liver yin and calm liver yang; Acting on ren meridian can regulate yin meridian; Acting on Du meridian can regulate Yang meridian.