Abstract: Now YAG laser has been widely used in cataractous operation,for example extracapsular cataract extraction, posterior chamber implant and antirior capsulectomy of the lens before congenital cataractous operation.YAG laser may avoide the stimulate of apparatus,which may inducethe comeal endothelium lesion and other complication, shorten the operation time. This paper introduces the manyoperation situations of YAG laser madecine,analyze the complication, prevention and management method.