Chronic complications of diabetes include: 1. diabetic eye disease; 2. diabetic nephropathy; 3. diabetic neuropathy; 4. diabetic cardio-extremity macrovascular disease; 5. diabetic foot; 6. diabetic skin lesions. Chronic complications are a kind of cumulative result of poor long-term control of patients’ blood sugar, and are the main cause of later disability and reduced quality of life of diabetic patients. Research shows that patients who can effectively control blood sugar for a long time will be able to stop or delay the occurrence and development of chronic complications.