Osteoporosis (osteoporosis) is a systemic bone disease that results in a decrease in bone density and quality, destruction of bone microarchitecture, and increased bone fragility due to multiple causes, making it prone to fractures. Osteoporosis is divided into two major categories: primary and secondary. Primary osteoporosis is divided into postmenopausal osteoporosis (type I), senile osteoporosis (type II) and idiopathic osteoporosis (including adolescent type). Postmenopausal osteoporosis generally occurs within 5 to 10 years after menopause; senile osteoporosis generally refers to osteoporosis that occurs after the age of 70; and idiopathic osteoporosis mainly occurs in adolescents, the cause of which is still unknown. How to prevent osteoporosis and slow down its process? We suggest the elderly to do the following: 1, is to have a regular life, quit smoking and limit alcohol; 2, is not partial diet, to consume sufficient amount of calcium and various vitamin food, drink more milk is very necessary; 3, is to strengthen exercise, usually often planned to participate in outdoor activities, such as playing tai chi, walking, jogging, etc., the amount of exercise should be determined according to their own physique, and at the same time should often sunshine; 4, is Take some preventive medicine. A person’s daily demand for calcium is 1000 mg, while according to our diet, the daily intake of calcium is 400 units, which is far below the normal demand. Therefore, we suggest that calcium medication and vitamin D can be taken appropriately.