Children with autism typically start at less than 36 months of age and present with three core categories of symptoms: social interaction disorders, communication disorders, narrow interests and stereotypical repetitive behavioral patterns. Children usually show abnormalities before the age of 3. The three major disorders vary at different times in the child’s development and have corresponding characteristics in intelligence, perception and emotion. 1. Social communication disorder Children with this disorder have qualitative deficits in social interaction. In infancy, the child avoids eye contact, lacks interest and response to human voices, does not expect to be picked up, or is stiff and unwilling to get close to others when picked up. In early childhood, the child still avoids eye contact, often does not respond to calls, does not develop attachment to parents, lacks interest in interacting or playing with peers, does not interact with peers in an appropriate manner, does not form partnerships with peers, does not share happiness with others, and does not seek comfort from others when upset or hurt. After school age, as they grow older and their condition improves, children with the condition may become friendly and affectionate toward their parents and peers, but still clearly lack the interest and behavior to actively interact with others. Although some children are willing to interact with others, there are still problems with the way they interact. They lack understanding of social constants, lack responsiveness to the emotions of others, and are unable to adapt their behavior to social situations. In adulthood, the children still lack the interest and social skills to establish romantic relationships and get married. (1) Non-verbal communication disorder: Children with this disorder often cry or scream to express their discomfort or needs. The older child may pull the adult’s hand towards what he wants lacking the corresponding facial expression, and his expression often appears indifferent, rarely expressing his will by nodding, shaking his head, waving his hands and other actions. (2) Speech communication disorders: Children with this disorder have obvious speech communication disorders, including: ① Language comprehension is impaired to varying degrees; ② Speech development is delayed or non-developed, and some children have expressive speech until the age of 2 to 3, but it gradually decreases or even disappears completely; ③ Speech form and content abnormalities: children often have imitation speech, stereotypical repetition of speech, grammatical structure, personal pronouns are often wrong (4) Impaired speech use: Although some children can recite children’s songs, recite, and “tell words, they seldom use speech to communicate, and they do not propose topics, maintain topics, or talk only with stereotyped repetitive phrases, and dwell on the same topic. 3. Narrow interests and repetitive stereotyped behaviors Children with autism generally exhibit one or more stereotyped behaviors or stereotyped actions, such as spinning, sniffing, waving hands, playing with switches, running back and forth, arranging toys and blocks, being particularly attached to a particular kind of object, loving to watch TV commercials or weather reports, and listening to a particular piece or pieces of music, but are usually not interested in moving hiss films. Often there are certain kinds of stereotyped behaviors at a certain time, which are not constant. 4. Abnormal intelligence About 70% of children with autism are intellectually backward, but these children can appear to have a strong ability in certain areas. 20% have an intelligence in the normal range, and about 10% have an exceptional intelligence. Most children with autism have a good memory in certain areas, especially in mechanical memory, such as numbers and chronology. They are particularly interested in music. 5.Sensory abnormalities Most children with autism have sensory abnormalities, including a particular fear or preference for certain sounds, some exhibit a fear of certain visual images, many children do not like to be hugged, and pain retardation is often seen. Hyperactivity and distractibility are more apparent in most children with autism and are often misdiagnosed as childhood ADHD. In addition, tantrums, aggression, and self-injury are more common in children with autism, and these behaviors may be related to the greater use of scolding or punishment in parenting.