Hyperglycemia can be lowered quickly by using insulin, but it is usually not recommended to lower blood glucose at the fastest speed to avoid hypoglycemia. Hyperglycemia needs to be controlled by long-term comprehensive treatment such as diet, exercise and medication. 1. Diet control: individualized diabetic diet plan is formulated according to the patient’s own situation, controlling the total energy intake and reasonably distributing nutrition. 2. Exercise therapy: The doctor will guide the patient to carry out appropriate exercise according to the patient’s blood glucose control situation and body mass index, which can help control blood glucose. 3. Oral drug therapy: Oral α-glucosidase inhibitors such as acarbose and miglitol can be taken to reduce postprandial hyperglycemia; biguanides such as metformin can be used in combination with insulin to reduce insulin dosage and blood glucose fluctuation. 4. Injectable drug treatment: Insulin injection can work quickly to reduce blood sugar. It is recommended that patients with high blood sugar go to regular hospitals for consultation, make individualized glucose-lowering program under the guidance of doctors, lower sugar reasonably, and don’t blindly use drugs by themselves, so as not to delay the condition or lead to adverse reactions.