If the blood glucose reaches 30mmol/L or above in 2 hours after meal, it is suggestive of diabetes mellitus. In the case of excluding complications such as diabetic ketoacidosis and diabetic hypertonic coma, the main treatment should be given to hypoglycemic medication, followed by dietary control, regular monitoring of blood glucose, and appropriate exercise, and so on. 1. Diabetic ketoacidosis: it is a common complication of diabetes mellitus, which needs to be treated with rehydration, hypoglycemia, acid correction, potassium supplementation and other symptomatic treatments. 2. Diabetic hyperosmolar coma: the main treatment is fluid replacement, hypoglycemia and potassium supplementation. 3. Hypoglycemic treatment: taking oral hypoglycemic drugs or subcutaneous injection of insulin to lower sugar. In daily life, we should strictly control the diet, small and frequent meals, and avoid taking high sugar foods. Regular monitoring of blood glucose changes can serve as an important basis for adjusting drug dosage as well as the method of drug administration. Appropriate exercise, especially for obese type 2 diabetes patients, should maintain a certain amount of exercise. The blood glucose of 2 hours after meal reaches more than 30mmol/L needs to be treated in time to avoid adverse consequences.