Rickets is not a hereditary disease, and due to the children’s body vitamin D insufficiency, so that the metabolism of calcium and phosphorus disorders produced by a systemic chronic nutritional diseases characterized by bone lesions, mainly in infants less than 3 years old, occurring in 3 months – 2 years old children. The main causes of rickets are as follows: 1. Insufficient sunlight exposure or insufficient intake of vitamin D. 2. Rapid growth or congenital vitamin D reserve is insufficient, and supplemental food and vitamin AD preparation are not added in time. 3. Gastrointestinal tract or some diseases of the liver or kidney, which affects the absorption of calcium and phosphorus. 4. Taking Phenytoin sodium, Phenobarbital and so on, which affects the absorption and utilization of vitamin D and calcium and phosphorus. 5. absorption and utilization. The treatment of rickets is mainly reasonable nutrition, add supplemental food on time, if it is in the cold season or lack of outdoor activities, as well as the rapid growth of the child’s stage, it should be appropriate to add vitamin D preparations and calcium supplements.