Ice is mainly used for local tissue swelling after local trauma or strenuous activities, which can reduce the local tissue swelling by constricting the dilated blood vessels through ice, thereby reducing tissue extravasation. Clinically, when the body is swollen due to trauma and other local tissues, it can be considered with the application of ice. In addition, after strenuous activities of athletes, ice can be applied to make the tired muscles get rest, reduce muscle strain, to a certain extent to protect the role of athletes. The role of ice is mainly the above two aspects, the clinical need to choose the appropriate treatment method according to the specific situation. If the injury is more than twenty-four hours, then you can not use ice, you need to change to heat. At the same time in the ice at the same time to pay attention to the time and intensity of ice, do not ice and cause local tissue damage, causing adverse consequences.