Normal tongue moss is white, that is, Chinese medicine often said in the diagnosis of light red tongue, thin white moss, indicating that people’s five viscera function is normal, physiological function is also normal. Normal people have a layer of thin white and moist moss on the back of the tongue, called tongue moss, the normal color is white, generally thin and uniformly flat on the tongue, in the middle of the tongue, the root is slightly thick. Because the tongue moss from the stomach gas, and the five viscera are endowed with gas in the stomach, therefore, changes in the tongue moss can reflect the viscera of cold, heat, false, solid, the nature of the disease and the depth of the disease, tongue moss diagnostics include looking at the moss color, looking at the moss quality of the two parts. Moss color, that is, the color of the tongue, mainly white moss, yellow moss, gray and black moss. Thin white and moist tongue moss is normal tongue moss, but also indicates that the disease is on the surface of the body but not into the inside. Yellow moss is the main heat evidence. Gray and black moss suggests that the disease is more serious. If there is an abnormality in the tongue coating, it is recommended to consult a hospital and standardize the treatment under the guidance of a physician.