Meridians include meridians, collaterals and affiliated organizations, which have physiological functions such as communication, operation of qi and blood, induction and conduction, and regulation of functional balance. The meridians include twelve meridians, eight odd meridians, twelve meridians, etc. The twelve meridians are the main channels for the operation of qi and blood. The twelve meridians are the main channels for the operation of qi and blood; the eight odd meridians have the function of contacting, commanding and regulating the vitality of qi and blood in the twelve meridians; and the twelve meridians have the function of strengthening the connection between the surface and the inner meridians. The channels and veins include Beiluo, Fuluo and Sunluo. The other channels have the function of strengthening the connection between the two channels on the surface of the body and the role of yin and yang of the whole body; the floating channels have the function of communicating with the meridians and reaching the surface of the muscles; the Sun channels have the function of passing the Rongwei and overflowing the Qi evil. Affiliated organizations include the meridian tendons and the skin. The meridian tendon has the role of managing joint movement, maintaining normal body movement function, and maintaining normal body shape; the skin has the role of protecting the body, resisting external evils, reflecting the disease, and assisting in diagnosis.