2. Short-term intensive insulin therapy (about 14 days) is needed for newly diagnosed type 2 diabetes mellitus with particularly high blood sugar, so as to alleviate glucose toxicity and restore some islet functions;

3. Patients with type 2 diabetes who are obviously emaciated suggest that islet function is poor and insulin needs to be supplemented;

4. When patients with type 2 diabetes have complications, this is a strong indication of insulin;

5. When oral drugs are ineffective, patients with type 2 diabetes need insulin injection.

6, oral drugs: drugs to improve insulin resistance-metformin, pioglitazone;

Drugs that promote insulin secretion-sulfonylureas, such as glimepiride and glibenclamide; Dietary regulators-Novolone and Freddy;

A drug that inhibits glucose absorption-α -glucosidase inhibitor-Baitangping;

New drugs: GIP- 1 agonist, DPP-ⅳ inhibitor.