Obiective 1 Definition types and mechanism of osteoporosis 2. Diagnosis, prevention and treatment of osteoporosis 3 Etiology and Epidemiology of osteoporosis times-45 minutes×2Objective 1、Definition、types and mechanism of osteoporosis 2、 Diagnosis、prevention and treatment of osteoporosis 3 、Etiology and Epidemiology of osteoporosis times – 45 minutes×2