Muscle contusion and articular ligament injury are common among athletes andhave often been treated with a cold compress of Chloro-ethane, which is combustibleand even explodable. For safety's sake we have, after repeated physical and chemical tests and expe-riments on animals, worked out a new freeze-analgesic aerosol, using Freon (F_12) assubstratum and some aromatic ingredients as additives according to both Western andChinese pharmacology. It has been applied some 500 times and a comprehensivestudy made on 118 cases whose records are comparatively intact. The subjects include 81 males and 37 females and among them are 39 footbal-lers, 24 volleyballers, 13 basketballers, 18 gymnasts, 12 track and field athletes, 6fencers, 5 wrestlers and 1 weightlifter. 105 cases, or 90%, are acute soft tissue inju-ries while the rest are chronic injuries causing pain in physical exertion. The effectiverate is 100% with muscular fascia injury and 92% with tendon and articular capsuleinjury. The new aerosol is also markedly effective in treating periostitis of tibia andRotator cuff injuries and in giving first aid to soft tissue injuries for an early re-covery of the lesion. It may be used in all temperatures and produces a satisfactoryhemostatic effect.