Mental retardation can be treated. First, we have to treat the cause of the disease. If the cause has been identified, such as those caused by some chronic diseases, drug poisoning, traumatic brain injury, or hearing and visual impairment, the cause should be removed as much as possible so that their intelligence can be partially or completely restored. Children with hypothyroidism, phenylketonuria, and abnormal endocrine metabolism should be diagnosed early, and after diagnosis, thyroid hormone replacement or special diet therapy for phenylketonuria can be used early to improve their intelligence level. If the mental retardation is caused by psychosocial and cultural reasons, it is necessary to change his living environment, let him live in a friendly and harmonious family life and strengthen his upbringing, which can also make partial progress of his intelligence. At present, most of the pediatric departments of hospitals have comprehensive rehabilitation methods, such as language cognitive training and oral muscle training, the main function of which is to improve the cognitive ability of children, and to teach children who have poor oral muscle ability or do not know how to use breath to pronounce words, and some group classes, such as guided education There are also group classes such as guided education, structured education, etc., which can improve children’s communication attitude, such as sensory integration training, auditory integration training, multisensory stimulation, visual music therapy, and also combined with transcranial magnetic therapy, acupuncture therapy, etc.