Heated salt bags mainly play the role of heat therapy and light local pressure, the advantages are the following: First, safe and non-toxic, salt is not radioactive, toxic, very safe for patients to use. Second, access is relatively easy, you can buy in the store, you can buy different sizes of salt bags according to the different weight requirements, the size of the use area. Third, after heating the local heat therapy, can activate blood circulation, promote local blood circulation, have a certain therapeutic effect. Fourth, when pressurized, the local can avoid the generation of dead space after surgery, which is conducive to tissue apposition and promote the growth and recovery of tissue. Fifth, the salt bag can be attached to the physiological curvature of the human body, and the shape of the salt bag can be adjusted in uneven places to produce uniform pressure, which is still better for the wound.