Diet without residue includes all kinds of vegetable juice, fruit juice, milk, rice and other foods that contain little crude fiber and are easy to digest and absorb. Diet without residue refers to a diet that is easy to digest and does not contain residue. Various kinds of fresh fruit and vegetable juices, soft noodles and thin rice, filtered soymilk, and lotus root powder and other parafluid foods contain almost no crude fiber, which belongs to the diet without residue. Diet without residue is especially suitable for postoperative gastrointestinal tract and gastrointestinal tract inflammatory lesions and tumor lesions, which can reduce the stimulation of food residue, and is conducive to the recovery of gastrointestinal function. For the recovery of gastrointestinal function or general anesthesia after surgery need to follow the doctor’s instructions for a residue-free diet, but also need to pay attention to reasonable nutrition, to ensure a balanced and comprehensive diet. For the normal population due to the lack of fiber and other nutrients in the diet without residue, not recommended for long-term consumption.