The primary prevention of diabetes is to avoid the onset of diabetes, mainly for patients at high risk of diabetes, such as patients with a clear family history of diabetes, patients with a relatively obese body type or patients whose fasting blood sugar is in a high state after many years of check-ups, all belong to the primary prevention and special attention. The main intervention is to pay attention to diet control and to eat less food with high sugar content. In addition, we should exercise more, especially appropriate exercise after meals. Eating less unhealthy food, such as less fried food and food with high calorie content, are the key elements of primary prevention. In addition to primary prevention, secondary prevention focuses on early detection and effective treatment of diabetes, and tertiary prevention delays and prevents the emergence of diabetes complications.