Diabetic nephropathy and retinopathy both belong to microangiopathy, which is a characteristic lesion of diabetes. Diabetic nephropathy is divided into five stages, the first two stages are not easy to diagnose, the third stage is the stage of microalbuminuria, the fourth stage is the stage of clinical proteinuria, and the fifth stage is the stage of end-stage nephropathy. Diabetic nephropathy should firstly control the primary disease, that is, diabetes, and strive to control the blood sugar at the ideal level; secondly, control the blood pressure and blood lipids. Thirdly, we should pay attention to the protein intake: in the microalbuminuria stage, the protein intake is about 1.0 grams per kilogram of body weight per day; in the clinical proteinuria stage, the protein intake is 0.8 grams per kilogram of body weight per day; in the end-stage nephropathy stage, the protein intake is better than 0.8 grams per kilogram of body weight per day. Protein is mainly eggs and milk and other high-quality protein, forbidden to eat soy products, no broth, more fresh vegetables, appropriate coarse grains, end-stage renal disease patients, avoid strenuous exercise. Test blood sugar, blood lipids and blood pressure.