Have a definite aim. The advantage of follow-up after operation is that it is more targeted; From the doctor's point of view, the doctor in charge is familiar with the patient's condition, and the guidance on the condition after discharge is more targeted. Return visit is a system initiated by the people's judicial organs to test the trial effect. Refers to the court after a period of time, take the initiative to send personnel to the place where the case occurred to listen to the opinions of relevant personnel.