Thick and greasy tongue coating is mostly due to disharmony between spleen and stomach and indigestion in children. At this time, medication should be given to strengthen the spleen and stomach. Food should be light and easy to digest, such as noodle soup and porridge, and eat less sweet and greasy food. Thin yellow or thick yellow greasy tongue coating is mostly due to deficiency of spleen and stomach in children, which leads to damp-heat of spleen and stomach or gastrointestinal stagnation, resulting in indigestion and malabsorption. At the same time, children are often accompanied by dry mouth, irritability, dry stool or diarrhea, bloating and other symptoms. At this time, children should not eat or eat less greasy food, especially big fish and meat, and eat less puffed snacks and melon seeds, except Chinese patent medicines such as Shen Ling Baizhu Powder and Fructus Aurantii Pills. Map tongue is a piece of white fur and a piece of tongue substance appearing on a child's tongue, which is like a national border on a map and is called "map tongue". Traditional Chinese medicine believes that most of them are "deficiency of both qi and yin in the stomach, that is, accumulation of heat in the spleen and stomach or indigestion." At the same time, it also reminds children of the lack of trace elements, such as zinc. The mildew sauce coating is red, black and yellow, which looks like mildew on beans, so it is called "mildew sauce coating". This is the manifestation of food accumulation and heat accumulation in children, and should be treated with clearing away heat and promoting diuresis and light diet. Children with tongue coating often change color because of taking medicine and eating. For example, eating Chinese medicine, olive, dark plum and iron can make the tongue coating black, and eating milk, soybean milk, orange, egg yolk and persimmon can make the tongue coating black. This is normal, there is no need to panic. China early education experts said that two kinds of abnormal tongue coating are common in clinic, and children are mainly digestive system diseases. In addition to symptomatic treatment, parents should also appropriately change their children's diet structure, eat more digestible and light diets, and slowly recuperate.