There are many types of cataracts, commonly aged, concurrent, traumatic, and congenital cataracts. Their common feature is visual impairment, and surgical treatment is the most effective way to lift the visual impairment of cataracts. The traditional surgical approach is usually chosen when the lens is completely cloudy. Diabetic cataract surgery belongs to the difficult category, which is potentially more risky for patients, and there is even a folk saying that diabetic cataract cannot be operated, our ophthalmology department has accumulated rich experience in diabetic cataract surgery, and patients can get good surgical results after adequate pre-surgical regulation. 1. General patients are operated when their visual acuity is 0.4 In recent years, cataract ultrasonic emulsion extraction and IOL implantation have not only reduced surgical trauma and improved efficacy, but also greatly advanced the operation time, completely relieving patients of the pain of low visual acuity who used to wait for surgery. Many patients have recovered their vision through surgery at the early stage of visual impairment (such as 0.4 or so), resulting in significant improvement in quality of life. 2. Diabetic patients with cataracts should be operated as early as possible. Diabetic patients often develop diabetic retinopathy and other eye damage. Doctors require eye examinations every 3 to 6 months with the aim of blocking the occurrence and development of diabetic eye disease as early as possible. When diabetic cataracts occur, they not only impair the patient’s vision, but also directly affect the doctor’s examination and treatment of the fundus, as the cloudy lens blocks incoming and outgoing light. Thus, cataract surgery for diabetic patients can not only relieve the visual impairment but also remove the obstacles to the examination and treatment of diabetic retinopathy, so the surgery should be performed as early as possible. 3. Detailed examination and investigation to reduce the risk of surgery Due to the presence of diabetes, the risk of surgery is relatively greater than that of normal people, such as the increased probability of complications such as bleeding, infection and non-healing wounds. Therefore, before surgery, diabetic patients must undergo various corresponding examinations and have a comprehensive and integrated assessment of all indicators in order to reduce the risk of surgery. ①To control blood sugar under the guidance of a specialist, blood sugar is stable and the risk of surgery is reduced. ②A detailed eye examination, especially visual function and fundus examination, should be done. Because another eye complication of diabetic patients is fundopathy, which has different degrees of visual function at different times. Knowing the degree of fundus lesions, we can predict the vision condition after cataract surgery, and the doctor can also give appropriate treatment according to the patient’s eye, sui condition. Pre-operative physical examination: check blood pressure, ECG, chest X-ray, liver and kidney function to exclude systemic diseases and ensure the safety of surgical procedure and post-operative medication. Before diabetic cataract surgery, we should also pay attention to the patient’s general condition, and blood sugar should be controlled to near normal level to ensure the safety of surgery. Combined medications should also be used to prevent complications and predict the outcome of surgery. After surgery, it is still important to control blood sugar, use medication as prescribed by the doctor, avoid rubbing the eyes and do not do strenuous exercise. 4. After cataract surgery, it is more important to evaluate the fundus lesions under the monitoring of doctors. Usually, the fundus lesions will accelerate the progress after surgery, and retinal photocoagulation therapy needs to be implemented as soon as possible, so as to ensure no further loss of vision and to avoid blindness caused by fundus lesions.