Tongue diagnosis includes tongue texture and tongue coating. However, it is not possible to prescribe medicines based solely on the tongue diagnosis, and the four diagnoses should be combined to recognize the evidence. Tongue, i.e. tongue body, is the muscle and vein organization of the tongue, for the internal organs of the qi and blood to be glorified. Look at the tongue, including the tongue of God, color, shape, state of the four aspects, in order to observe the internal organs of the virtual reality, the vitality of the blood. Tongue moss is a layer of moss attached to the tongue, is the stomach gas on the steam. Looking at the tongue moss, including the diagnosis of moss quality and moss color, in order to observe the depth of the disease, the nature of the disease, the evil and positive growth and decline. Clinically, it can be seen that the tongue is pale and white, red tongue with little moss, and red tongue with yellow and greasy moss. Tongue light moss white mostly for normal people tongue, but also can be seen superficial light, if accompanied by cold (fear of cold) fever, no sweat, body pain and other symptoms, can be identified to take ephedra soup treatment. Red tongue with little moss is mostly a sign of yin deficiency. If accompanied by hot flashes and night sweating (abnormal sweating after going to sleep and stopping after waking up), zygomatic redness (redness of cheeks and zygomatic bones), and heat of the hands, feet and heart, etc., it can be treated with Zhi Bai Di Huang Wan. Red tongue with yellowish greasy moss is a symptom of dampness-heat internal agglutination. If it is accompanied by fever in the afternoon, body heat without raising (feeling the whole body is hot, but touching the skin is not very hot), drowsiness of the limbs, lack of appetite, sticky stools, yellowish-red urine, etc., it can be diagnosed and treated with Sanren Tang. Clinical symptoms and signs of the disease are complex, not only based on the tongue diagnosis of the performance of the use of drugs, it is recommended that the treatment under the guidance of a professional physician to identify the evidence.