1. Elevate the affected limb to reduce the swelling of the limb, pay attention to the presence of pressure symptoms, and observe the blood flow, skin color, temperature, swelling, sensation and movement changes at the end of the finger (toe) at any time, and the situation. If there is any change, remove the cast immediately and fix the cast on again when the condition improves. 2.Patients with wounds, if the cast is found to be soaked with blood or exudate, should be treated promptly. 3.The plaster must be kept dry and clean. If the wrapped cast is eroded by water, it is not only easy to shorten its service life, but also easy to cause skin rupture, impregnation and infection. Therefore, plastic bags can be used to protect the cast from water immersion when bathing, and the affected limb wrapped in the cast should not be stepped on the wet ground. 4, pay attention to cold and warm, cold season, pay attention to the limb exposed insulation; hot season, pay attention to ventilation, to prevent heat stroke. 5, pay attention to keep the cast clean, do not be soaked by urine, stool, etc. pollution. 6.If the cast is loosened due to swelling of the limb or muscle atrophy, the cast should be replaced immediately. 7.The child can be instructed to do the muscle contraction activity inside the cast. 8.After a long time in the cast, the skin inside the cast may feel itchy, do not put foreign objects into the cast to scratch or remove the cotton lining, and do not hide things inside the cast, because this practice not only can not eliminate the itchy feeling, but may put the scratching tool inside the cast can not be removed, which will shorten the life of the cast and cause skin injury. 9.Do not remove the cast without reason for the sake of momentary comfort! 10.During the period of external cast fixation, you should follow the doctor’s instructions for regular outpatient follow-up, photo review and functional exercise.