Liquid food is generally solid-free food, such as milk, soybean milk and so on. Semi-liquid food is mainly porridge, such as shredded vegetable porridge, minced meat porridge and egg congee. Liquid food is a kind of liquid food that can be melted into liquid in the mouth. Liquid food is easier to swallow and digest than semi-liquid food, and is often used for critically ill patients who are extremely weak and unable to chew food. Semi-liquid food is a kind of soft food, easy to digest and chew, with less crude fiber content and no strong irritation. Semi-liquid food is often used to treat patients with fever, chewing difficulty and acute gastroenteritis. After general surgery, the gastrointestinal tract of patients will be affected, so at the beginning of restoring diet, it is necessary to start with liquid food or semi-liquid food. Because the main ingredient of these foods is water, it can not only supplement the water of patients, but also not increase the burden of gastrointestinal tract.