If a patient has a soft tissue injury, a cold compress should be applied within 24 hours after the injury. When a patient has a soft tissue injury due to external force or other reasons, the subcutaneous capillaries will rupture and there will be blood leakage, and there will also be a certain amount of tissue fluid leakage, making the patient’s skin surface appear red, swollen, bruised, swollen and other symptoms. When these symptoms occur, cold compresses should be applied within 72 hours to not only reduce the sensitivity of the nerves and effectively relieve the patient’s pain, but also to constrict the blood vessels and reduce blood exudation, thus achieving the purpose of controlling the hematoma. Patients should change to hot compresses after 72 hours after the injury, which can promote blood circulation and accelerate the absorption of hematoma, but cold compresses should be applied within 24 hours.