There is no clear statistics on the average life expectancy of type 2 diabetes, but if patients with type 2 diabetes are treated in a standardized manner without serious complications, their life expectancy may not be affected, while acute and chronic complications may shorten the life expectancy of patients with type 2 diabetes, or even threaten their lives, if they are not treated in a standardized manner. Patients diagnosed with type 2 diabetes mellitus should take metformin, gliclazide and other hypoglycemic drugs under the guidance of a doctor or inject insulin therapy, with dietary control, appropriate physical exercise, blood glucose control in a reasonable range and not accompanied by serious complications, the patient generally does not affect the life expectancy, and get a long-term survival. Failure to actively cooperate with the doctor’s treatment leads to acute complications such as diabetic ketoacidosis and hyperosmolar hyperglycemic syndrome, which can threaten the patient’s life and even lead to death; if complicated by serious chronic complications, such as diabetic nephropathy, retinopathy, diabetic foot, etc., it may also shorten the patient’s survival period. Patients diagnosed with type 2 diabetes should actively cooperate with their doctors in treatment and maintain a healthy lifestyle, all of which will help prolong their survival.