The treatment of mental retardation can be divided into etiological treatment, training and rehabilitation, and symptomatic treatment. 1, etiological treatment: Although most etiological factors lack effective treatment, those with treatment possibilities should be treated early. For example, phenylketonuria should be treated with a low-phenylalanine diet as early as possible; galactosemia should be treated by stopping dairy foods early and replacing them with starchy foods such as rice flour and flour; congenital hypothyroidism should be treated with thyroxine replacement therapy starting soon after birth. 2. Training and rehabilitation: usually from simple to complex, from easy to difficult. Children with mild to moderate hypothyroidism should focus on training their work skills in order to become self-reliant. Most mildly affected children can approach the quality of life of normal people in adulthood, especially the lesser socio-cultural types, and can reach the intelligence and adaptability of normal people with early educational intervention. For severe and very severe cases, the focus should be on training the ability of self-care. 3.Symptomatic treatment: Give corresponding treatment for the accompanying symptoms. For example, anti-epileptic drugs can be given for epilepsy, physical rehabilitation therapy is needed for cerebral palsy, and corresponding orthopedic treatment should be given for visual and hearing dysfunction. The most fundamental aspect of reducing the incidence of mental retardation is prevention. This includes genetic counseling, perinatal care, newborn genetic metabolic disease screening, birth defect monitoring, etc.