A three year old child who has hearing and can talk and does not talk to adults may be suffering from autism, and it is recommended to visit the hospital early for behavioral treatment. Children with autism have the habit of repeating certain actions in a stereotyped manner, do not like to communicate with others, and do not look directly at others. The cause of the disease may be related to brain structure abnormalities, etc. Generally, behavioral treatment is adopted, mainly behavioral training and management applications, positive reinforcement of self-care and social skills to train performance and communication skills. Parents should intervene early in the treatment, can take the child to participate in group activities and so on. Three-year-old children with hearing will talk not talk to adults, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.