To compare the effect of dapagliflozin combined with CSII and CSII alone on glucose profile in newly diagnosed type 2 diabetes mellitus by continuous glucose monitoring system.

To compare the effect of dapagliflozin combined with continuous subcutaneous insulin infusion (CSII) and CSII alone on glucose profile in newly diagnosed type 2 diabetes mellitus by continuous glucose monitoring system.

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.