Medical ice bag external application is often used clinically for physical cooling, local pressure of the incision after surgery, a treatment method, medical ice bag according to the different conditions, the maintenance time also differs. If the patient has serious infection in the body, chills and high fever, the medical ice bag can be applied externally to the axilla, inguinal region, neck and other large blood vessels to enhance heat dissipation and reduce the patient’s body temperature, and most patients can have their infection controlled and their body temperature gradually decreased after 2-3 days of maintenance with the medical ice bag. Second, after inguinal hernia surgery, the patient often needs to perform local pressure of ice bag at the incision to reduce bleeding and avoid the formation of local plasmacytoma, which usually needs to be maintained for 24 hours to achieve complete hemostasis and pain relief. It should be noted that after one hour of contact with the body, the medical ice pack needs to be allowed to rest for 5-10 minutes to avoid frostbite caused by continuous external application.