There is no distinction between autism and intellectual disability that is more severe. There are mild and severe forms of autism, and there are mild and severe forms of intellectual disability. Mild autism can also lead a normal life. Both disorders are developmental disorders and can be considered disabilities. The most important manifestation of autism is the interaction disorder, which means that the child will not play with other children, the patient’s language development is delayed, some children may have no language, others have language at the age of two, but the language function will degenerate, even if there is language, but he can not use personal pronouns, can not express ideas correctly, can not initiate communication with others, his interests are very single, very narrow, and do things His interests are very single and narrow, and he does things very stereotypically. The majority of autistic people have intellectual disabilities, and their prognosis is very poor. They need supervision in their personal life and are unable to integrate into society or interact with others. The main manifestation of mental retardation is low intelligence and difficulty in adapting to society, but language development is basically unaffected, and the person is able to take care of his or her own personal life and even complete certain tasks with supervision, so relatively speaking, autism is more serious than mental retardation.