1, because the plaster is hard, and baby skin contact, need to use soft lining isolation, to avoid abrasion skin. 2, because the cast is brittle, need to strengthen care, avoid dropping and hitting the cast, avoid falling. 3.After the cast is fixed, use soft cushion to elevate the injured limb, which can reduce the swelling. 4.After the swelling of the limb has subsided, if the cast is loose, it should be replaced in time. 5.When the ambient temperature is too low, strengthen the warmth of the plaster fixation site to prevent hard swelling of the distal part of the affected limb. After plaster fixation, swelling and pressure may lead to ulceration, pressure sore and ischemic necrosis of the limb. Therefore, it is necessary to consult the doctor immediately in the following cases: 1. foreign body inside the cast, such as nails, peanuts, rice, small sticks, etc. 2, changes in blood circulation and sensory-motor conditions of the limb, such as cold skin of fingers and toes, pale or bruised or swollen pain or numbness, etc.