A linear fracture is a relatively minor fracture in terms of the shape of the fracture line, which is usually undisplaced. The common linear fracture is the skull cap linear fracture, which is a skull fracture of the skull cap that occurs under the action of external forces such as industrial and mining injuries, without displacement, and has a very high incidence in craniocerebral trauma, often combined with intracranial brain parenchyma injury. Prevention: a. Practice to strengthen the body: should actively and long-term adhere to exercise, increase the time in outdoor activities, more fresh air, promote the whole body blood circulation and metabolism. You can choose to walk, jogging, tai chi, health exercises and other projects. More activity can make the calcium in the blood more in the bone memory, thus improving the hardness of the bone, can effectively reduce the occurrence of fractures. The sunlight can promote the synthesis of vitamin D, and the metabolism of calcium depends on the role of vitamin D. The ultraviolet rays of the sun can promote the formation and absorption of calcium in the body, maintain the normal calcium and phosphorus metabolism, so that the increase of calcium in the bones and improve the hardness of the bone. Third, prevention before illness: the elderly should not go to places where there are many people and cars, and do not go out when it rains, snows or the ground is watery or icy, so as not to fall and fracture. Do not climb ladders or high activities, and do not walk on steep slopes, because the elderly are weak in the lower limbs and slow to respond to falls. Diet regimen: Eat more vegetables, protein and vitamin-rich diet to prevent the occurrence and development of osteoporosis. The diet should be light in the early stage of fracture to facilitate the removal of blood stasis and swelling, and heavy in the late stage, so as to choose a suitable diet to tonify the liver and kidney, which is conducive to the healing of fracture and recovery of function.