Legal analysis: The level of disability is determined based on the IQ value. Level 1 is divided into four levels, with Level 1 being the most severe and Level 4 being the lightest. Level 1 intellectual disability: extremely severe intellectual disability. IQ value is 20 or below. The adaptive behavior is extremely poor; the face is obviously sluggish; the entire life needs to be taken care of by others; the motor and sensory functions are extremely poor. If trained, the patient can only respond to the movements of the lower limbs, hands and jaws. Level 2 intellectual disability: severe intellectual disability. IQ value is between 20-25 or 25-40. Poor adaptive behavior; it is difficult to take care of oneself even after training, and still needs care from others; poor motor and language development, and poor ability to interact with others. Level 3 intellectual disability: moderate intellectual disability. IQ value is between 35-50 or 40-55. Incomplete adaptive behavior; incomplete practical skills, such as being able to take care of themselves partially and doing simple housework; having preliminary knowledge of health and safety, but poor reading and calculation skills; poor ability to distinguish the surrounding environment and being able to communicate with others in a simple way People interact. Level 4 intellectual disability: mild intellectual disability. IQ value is between 50-70 or 55-75. The adaptive behavior is lower than that of the average person; they have considerable practical skills, such as being able to take care of themselves and undertake general housework or work, but they lack skills and creativity; they can generally adapt to society under guidance. After special education, students can acquire certain reading and calculation skills and have better ability to identify the surrounding environment. Able to interact with people more appropriately.

Legal basis: "Practical Assessment Standards for People with Disabilities in China" Article 4 Standards for Intellectual Disability: 1. Definition of intellectual disability: Intellectual disability refers to a person's intelligence being significantly lower than the average person's level and showing adaptive behavior obstacle. Intellectual disability includes: mental retardation due to various reasons during the period of intellectual development; after intellectual development matures, intellectual impairment caused by various reasons and dementia caused by obvious decline in intelligence in old age. 2. The classification of intellectual disability is based on the intellectual disability classification standards of the World Health Organization (WHO) and the American Association on Mental Retardation (AAMD), and is divided according to their intelligence quotient (IQ) and social adaptive behavior. The list is as follows: Intelligence level grading IQ (intelligence quotient) range adapts to the behavioral level; severe level one <20 is extremely deficient; level two 20-34 is severe deficiency; moderate level three is 35-49 moderate deficiency; mild level four is 50-69 light Defects. "Note": 1. WeChsler Children's Intelligence Scale. 2. Intelligence quotient (IQ) refers to the ratio of mental age to actual age measured by a certain intelligence scale. Different intelligence tests have different IQ values. The main basis for diagnosis is social adaptive behavior.