Inclusion Criteria:  participate voluntarily and sign the subject informed consent before the test. for patients with type 2 diabetes who met WHO1999 diagnostic criteria, subcutaneous injection with premix insulin Bid/Tid, single drug and/or combination of oral hypoglycemic drugs, the treatment regimen was stable for more than 2 months. no acute complications such as diabetic ketoacidosis and diabetic hyperosmolar syndrome. subjects are able and willing to undergo FGM examination, diet and exercise regularly.  Exclusion Criteria:  patients treated with GLP-1 agonist in the last 3 months patients who are allergic to insulin. impaired liver and renal function, ALT 2.5 times higher than the upper limit of normal value;Serum creatinine was 1.3 times higher than the upper limit of normal. a history of drug abuse and alcohol dependence within the past 5 years. used systemic hormone therapy in recent 3 months. patients with poor compliance and irregular diet and exercise. patients with infection and stress within four weeks. patients who cannot tolerate flash glucose mornitoring. patients who are pregnant, nursing or or preparing to become pregnant. any other apparent condition or comorption as determined by the investigator, such as severe heart and lung disease, endocrine disease, neurological disease, tumor disease, other pancreatic disease, history of mental illness.