1, the occurrence of life-threatening acute complications of diabetes, such as combined ketoacidosis (blood glucose > 14mmol/L and positive urinary ketones), hyperglycemia hyperosmolarity (blood glucose > 20mmol/L), lactic acidosis, etc. These acute complications have a high mortality rate, and whether they can be successfully rescued is directly related to whether they are treated in a timely manner. 2, type 1 diabetes, the onset of significant weight loss, thirst, polyuria and other symptoms prominent, high blood glucose, lifelong need for insulin therapy, the purpose of hospitalization is to control hyperglycemia, eliminate symptoms, so that patients master the knowledge of diabetes, learn to inject insulin and can adjust the insulin dose according to blood glucose, urine glucose monitoring results. 3.When type 2 diabetic patients need insulin treatment, they should also be hospitalized to learn to monitor their condition and master insulin treatment. 4, the first onset of diabetes should be hospitalized to promote the recovery of pancreatic islet function, to partially or fully reverse the disease, and to delay the emergence and development of complications. 5.People with long-term hyperglycemia and poor treatment effect also need to be hospitalized to understand why the blood sugar is not well controlled and adjust the treatment plan. 6, combined with other pathologies such as pneumonia, heart disease, severe upper sensation, acute cholecystitis, stroke, fever, diarrhea and ulcers, necrosis, etc. should also be hospitalized, because only reasonable control of diabetes can control these pathologies. 7.Patients who need to perform surgical treatment should be hospitalized, even if it is a minor surgery, they should be hospitalized for treatment and observation, which is good for controlling diabetes and recovery after surgery. 8.Patients with serious diabetic complications should be hospitalized for a short period of time for the purpose of a comprehensive examination, to understand the extent of diabetic complications and whether there are other lesions, to develop a scientific treatment plan, to learn to observe the condition, to master the basic knowledge of diabetes, to observe the effects of treatment, and to curb the progress of complications. 9. Those who have frequent hypoglycemia during diabetes treatment and those whose blood pressure is not well controlled should be hospitalized in time to adjust the treatment plan and reduce the damage to important organs such as heart, annoyance and kidney.