Oral hypoglycemic drugs and insulin are important methods to control blood glucose in diabetic patients. As to whether it is better for diabetic patients to take medication or insulin treatment, it is necessary to choose a suitable treatment plan under the guidance of a doctor and according to the patient’s age, weight, blood glucose and complications. Insulin therapy is recommended in the following cases: 1. Type 1 diabetes, i.e. diabetes occurring in children and adolescents, is mostly characterized by pancreatic beta cell failure and needs to rely on insulin therapy. 2. Type 2 diabetes also needs insulin therapy in the following cases, such as type 2 diabetes with long duration, wasting, poor islet function, type 2 diabetes with fasting glucose >13.9 mmol/L, and combined with various Type 2 diabetes with acute and chronic complications also requires insulin therapy.3. Gestational diabetes requires insulin therapy throughout pregnancy.4. Certain special types of diabetes, such as diabetes after recurrent pancreatitis, also require insulin therapy.