Why can acupuncture therapy cure diseases? To understand this question one has to understand the functional characteristics of acupuncture. First of all, from the perspective of Chinese medicine, based on long-term medical practice, the three main functions of acupuncture are summarized, namely, adjusting yin and yang, supporting positive and eliminating evil, and unblocking the meridians and channels. When the human body is healthy and free of disease, the body is in a state of balance between yin and yang, the positive energy is strong, and the meridians are open; when the human body is sick, yin and yang are out of balance, the positive energy is weak and cannot overcome the evil energy, and the meridians are not open. Acupuncture has the effect of regulating the balance of yin and yang, supporting the righteousness and driving away the evil, unblocking the meridians and blood, and restoring the health of the human body. Secondly, from the results of modern research, acupuncture has a regulating effect, analgesic effect and tissue repair effect, and it can treat multiple organs, multiple systems and lesions of internal and external women and children, five senses and skin.