Chinese medicine believes that the lungs have the functions of being the main qi for respiration, the main water line, the direction of all the veins, and the main treatment of the joints. 1. The main qi for respiration: the main qi of the lungs includes the main respiratory qi and the main body qi in two aspects. The main respiratory qi means that the lungs have the function of inhaling the clear qi of nature and exhaling the turbid qi of the body to keep the respiratory rhythm organized. The main body of the qi refers to the lungs have the function of generating and running the body of the qi, with the lungs breathe in and out of the movement, regulating the whole body of the qi in and out of the lift. 2. The main line of water: this means that the lung qi’s propagation and purging has a dredging and regulating effect on the transmission, operation and excretion of water and liquid in the body. 3. Toward the Hundred Vessels, the Main Ruling Sections: The lungs are directed toward the Hundred Vessels, meaning that the lungs have the physiological function of assisting the heart to circulate blood around the body. The main governing section of the lungs means that the lungs have the function of regulating the breathing of the lungs and the qi, blood and fluid of the whole body.