In clinical work, it is found that some patients do not know what is scientifically correct to apply ice, so here to talk to you. The principles of ice: reduce as well as slow down the release of histamine, reduce tissue sensitivity to pain; reduce microcirculation and surrounding tissue exudation and swelling; reduce the role of vascular endothelial cells and thrombus formation; reduce the release of oxygen free radicals and so on. There are also many studies that show that microcirculatory disorders and the response to tissue damage secondary to them are not evident within the first 24 hours after injury. This is why it is important to apply ice as early as possible and for a sustained period of time. In this way, early and proper icing can achieve the goal of reducing the degree of tissue damage and accelerating tissue repair. So how to do ice? To introduce to you: 1, site: the pain or swelling of the part 2, material: ice water mixture is best (like KFC sells “ice drinks”) 3, time: generally 15-20 minutes each time. (This is generally the time it takes for the ice to melt away) 4. frequency: every 3-4 hours is the common method. 5, the course of treatment: generally used within 24-36 hours after the injury. (This is the general traumatic inflammatory effect of the basic elimination of time) steps to make ice bags: 1, take some ice, put into a plastic bag. 2, add the appropriate amount of tap water, made of ice water mixture (the temperature is basically kept at zero degrees, easy to control, and not easy to cause frostbite.) 3, close the plastic bag (seal, first the air above the water, in the position near the mouth of the bag knot. Benefits: ① ice bag will not be bulging, not easy to slip when placed, ② increase the contact area between the ice bag and the skin, ③ no air inside the ice bag, so the ice will not cause the surrounding is ice water, the middle is air, to achieve uniform ice.) 4, placed on the painful or swollen parts. (Should not leak, you can use a double plastic bag. Local pad thin towel.) ”Details determine success or failure”, scientific and correct icing, for sports injuries and post-operative rehabilitation is very important, but also one of the essential treatment modalities to achieve the best and safest icing effect.