Chronic complications of diabetes often occur without the patient’s knowledge, but cause a significant decrease in quality of life and are life-threatening. Various chronic complications of diabetes usually start to appear after 5 years of diabetes, and their early onset and severity are directly related to good or bad blood glucose control, blood lipids, blood pressure and so on. Therefore, for type l diabetic patients, they should be checked annually for the occurrence of their various chronic complications 5 years after the onset of diabetes. Type 2 diabetic patients often have diabetes for many years by the time it is discovered, so they should be checked annually for the occurrence of chronic complications from the time diabetes is discovered. Patients with diabetes should be tested regularly for the following: 1. Eye lesions: Diabetic complications can invade all parts of the eye, while mainly damaging the retina, lens and atrial circulation. They are detected early by performing fundus examinations and their progression is reversed or stopped by treatment. cataracts in type 2 diabetic patients have a high incidence, low age of onset and rapid progression compared to cataracts in the general elderly. Glaucoma is an increase in intraocular pressure caused by obstruction of atrial circulation in the eye, which can lead to serious consequences. 2. Cardiac lesions: such as diabetic cardiomyopathy and coronary artery disease, both of which can be monitored by electrocardiogram examination. When there is no abnormal change in ECG, it can be checked once every six months. When there is abnormal change in ECG or accompanied by hypertension and arteriosclerosis, it should be treated actively. 3, liver function: diabetes lipid metabolism disorder, can cause fatty liver and damage liver function; oral hypoglycemic drugs in the liver decomposition, may lead to liver function damage, so long-term use should check liver function, once the damage, can be timely change drugs. 4, kidney function: diabetic nephropathy can affect the kidney function, oral hypoglycemic drugs, especially sulfonylurea hypoglycemic drugs (except sugar suitable for 5% by the kidney excretion) through the kidney excretion of 50% to 70%, so long-term medication should be regularly kidney function check. 5, diabetic foot: due to peripheral circulation disorders and nerve disorders make the foot prone to dystrophic lesions, therefore, the monitoring of the foot is of great importance. Under sufficient light, the foot skin should be observed for breaks, cracks, calluses, trauma and inflammation, barbs, and nail cleaning.