Drainage strips are the intermediary for accomplishing drainage. They are placed in the surgical area to drain localized exudate, pus, blood or leakage from the body. The types of drains commonly used in clinical surgery are: gauze, latex sheets, cigarette drains, adhesive tubes, cannulated plastic drains, and adhesive films. Different types of drains are used for different purposes. For example, gauze is generally used for shallow wounds, and gauze drainage is further divided into oil gauze and saline gauze, etc. Among them, oil gauze is lubricated and less irritating, which can make the exudate or pus flow out smoothly, and at the same time prevent the wound from sticking shut. The purpose of placing drainage strips after surgery is to prevent various fluids from being retained in the tissue space or body cavity, so as not to affect the healing of the tissues, and at the same time, to prevent secondary infections; it can also be used to observe whether there is any active bleeding or anastomotic leakage in the surgical area after surgery, and at the same time, to observe the changes in the nature and amount of drainage fluid. Drainage strips need to be changed regularly and replaced after placement; if there is no obvious drainage of fluid out of the drainage area, the strips should be pulled out or removed in time.