Comparing the Accuracy of Different Blood Glucose Monitoring Systems (CGM and FGM)

Inclusion Criteria: * volunteer to participate and be able to sign informed consent prior to the trial. * patients with type 2 diabetes or type 1 diabetes, aged 18-80 years old. * No acute complications such as diabetic ketoacidosis, diabetic hyperosmolar syndrome, etc. * Subjects are able and willing to monitor peripheral blood sugar and regularity of diet and exercise. Exclusion Criteria: * Patients with insulin allergy. * Impaired liver and kidney function with 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. * Drug abuse and alcohol dependence in the past 5 years. * Systemic hormone therapy was used in the last three months. * Patients with poor compliance and irregular diet and exercise. * Patients with pregnancy, lactation or pregnancy intention. * Any other obvious conditions or associated diseases determined by the researcher: such as severe cardiopulmonary diseases, endocrine diseases, neurological diseases, tumors and other diseases, other pancreatic diseases, history of mental diseases.