The indications for cold therapy are mainly the following: 1. For acute injuries, such as local soft tissue contusions or even fractures resulting in painful swelling of the limb or traumatic wound rupture and bleeding, cold therapy can be applied under local pressure bandaging to prevent further aggravation of swelling of the limb and to stop bleeding locally. 2. The effect of cold therapy on the wound or limb after surgery is also good, usually preventing further aggravation of the edema of the limb, which is conducive to late recovery. 3, for the acute inflammatory period, such as local aseptic inflammation of the joint, or bacterial infection caused by local skin redness, swelling, heat and pain, the effect is also better.