Orange peel, also known as Chen Pi, is pungent, warm and aromatic, and has the effects of regulating qi and lowering rebelliousness, toning the middle and opening the stomach, and drying dampness and resolving phlegm. Chen Pi is good at regulating qi and can treat qi stagnation in the spleen and lung meridians, such as chest and diaphragm congestion, belching, eructation and vomiting, all of which can be treated with Chen Pi. It can also regulate the middle and open the stomach. For patients with accumulation of food and drink, poor appetite and loss of appetite, Chen Pi can be used to strengthen the spleen and open the stomach and regulate the middle. It can also dry dampness and dissolve phlegm. For phlegmatic diseases of the lung and spleen, Chen Pi can be used to dry dampness and dissolve phlegm, such as common chronic bronchitis, asthma, phlegm-dampness of the spleen and stomach, and food stagnation.