Since weight reduction metabolic surgery can treat diabetes was confirmed, it has caused a great stir in the medical community. A lot of experience has been accumulated in Europe and America in applying metabolic surgery to treat diabetes and obesity, and clinical studies in different countries have achieved exciting results. A large number of studies have confirmed that surgical treatment can achieve a clinical remission rate of 77%-95% for type 2 diabetes, which means that metabolic surgery can make The majority of patients with type 2 diabetes are free from medications and can lead a normal life. Diabetes usually goes hand in hand with obesity, and in China, the proportion of adults with diabetes is increasing. According to statistics, China is the number one country in the world with diabetes, with 109.6 million patients and 1.3 million deaths from diabetes and its complications in 2015. The complications of diabetes are the most reliable. Diabetic retinopathy is one of the serious microvascular complications of diabetes and a major worldwide blindness-causing disease, with a blindness rate of 25%, 25 times higher than that of normal people. According to statistics, retinopathy can be detected in 20% of type 2 diabetic patients at the time of initial diagnosis. Even among diabetic patients with normal fundus, about 5-10% develop fundus changes within one year. Early diabetes is asymptomatic, does not affect normal life, and is often overlooked. Therefore. Prevention is the key to prevent and control diabetic sex, and strive for early detection, early diagnosis and early treatment.