Diabetic retinopathy (DR) is the most important manifestation of diabetic microangiopathy. The most common complaints are flash sensation and vision loss, and its fundus manifestations include microangioma, hemorrhagic spots, hard edema, cotton wool spots, retinal vasculopathy, maculopathy, vitreous and optic neuropathy. The staging criteria are as follows: diabetic retinopathy staging criteria Ⅰ microangioma or combined with small hemorrhagic spots Ⅱ hard depths combined with stage I lesions Ⅲ cotton wool spots combined with stage I or II lesions Ⅳ neovascularization or with vitreous hemorrhage Ⅴ fibrovascular proliferation membrane Ⅵ retinal detachment by traction Note: the first 3 stages are non-proliferative, also known as simple or background, and the last 3 stages are proliferative and can contain the first 3 stages of lesions ophthalmologist according to the patient The ophthalmologist will make the corresponding treatment plan for the patient according to the fundus photography: 1. Stage I and II patients will be given oral absorbent to improve microcirculation and promote absorption treatment, and will be reviewed regularly for three months. 2.Stage III and IV patients are treated with local or whole retinal laser photocoagulation according to the retinal vascular non-perfusion area in fundus photography, supplemented with absorption agents to promote absorption. The fundus photography should be reviewed 1 month after laser photocoagulation, and whether to supplement laser photocoagulation should be considered depending on the fundus photography. 3.Stage V and VI patients need to undergo vitrectomy to remove the mechanized membrane, loosen the pull of the mechanized membrane on the retina, inject liquid or gas to restore the normal retinal anatomy and keep the eye intact for laser photocoagulation treatment.