Fat malabsorption, also known as steatorrhea, is a syndrome caused by the digestion and malabsorption of fat and can be seen in a variety of diseases, such as pancreatic, hepatic, biliary and intestinal disorders. Steatorrhea caused by intestinal lesions is often accompanied by malabsorption of various other nutrients, which is called malabsorption syndrome. The small intestine is the main site for absorption of various nutrients. Due to various reasons, nutrients, especially fat, are not fully absorbed by the small intestine, resulting in diarrhea, malnutrition and weight loss, which is called malabsorption syndrome. One type of disease, which used to have an unknown cause, is called idiopathic malabsorption syndrome or celiac disease, but is now known to be caused by an allergy to gluten in wheat foods. Prevention of steatorrhea in children is important. 1. actively prevent and treat malnutrition diseases. 2.Actively treat all kinds of obstructive or reflux jaundice and treat all kinds of intestinal infectious diseases. 3.Enhance physical fitness and improve their immunity: pay attention to more rest, participate in more physical exercise, and eat more fresh fruits and vegetables rich in vitamins.