Patients with type 2 diabetes mellitus with blood glucose 7.9mmol/L 2 hours after dinner can not decide whether to take glycemic insulin or not, insulin dosage should be adjusted according to pre-bedtime blood glucose and fasting blood glucose. Glycine insulin is adjusted according to pre-bedtime blood glucose and fasting blood glucose. 7.9mmol/L 2 hours after dinner is within the control range, such as patients who have never used insulin, they do not need to take glycemic insulin. If the patient has been using glycemic insulin, only based on the postprandial blood glucose level can not be arbitrarily discontinued, need to be combined with pre-bedtime blood glucose and fasting blood glucose under the guidance of the doctor to adjust the insulin dose. The insulin regimen for patients with type 2 diabetes should be formulated and adjusted by a professional doctor, and should not be adjusted by oneself.