Autism, also known as childhood autism, is a pervasive developmental disorder characterized by qualitative abnormalities in an individual’s social interpersonal and communication patterns, including multiple functional activities in a variety of settings, such as social interactions, impaired verbal expression, narrow range of interests, stereotypes, and other behavioral patterns. Autism has the following five major symptoms, characterized by the first three: social interaction deficits Social interaction deficits are at the core of autism. Some affected children show avoidance of eye contact with others and lack of facial expressions in infancy. When others want to pick him up, he often does not hold out his hands in a posture of expecting to be picked up as normal children do. He refuses to be hugged by others, has no obvious expression of attachment when parting from parents, and has no pleasant expression when seeing parents, and has the same expression as seeing parents when meeting strangers. Speech development disorders are very common and serious. Patients are silent or rarely use words, preferring to use gestures or other forms to express their wishes and requests. They tend to use gestures or other forms of expression to express their wishes and requests. They have poor verbal skills, do not initiate conversation, and often speak on their own, often with pronouns, stereotyped repetitive speech, and imitative speech. Impaired speech intonation and rhythm is manifested by self-stimulated speech, often screaming, humming or making “words” that are inaudible or incomprehensible to others, or talking to oneself, also known as “egocentric language”. Non-verbal communication is impaired by gestures or postural language, or by nodding, shaking the head, or other facial expressions to express a need. Narrow range of interests and stereotypical, rigid behavior towards the environment, tendency to require fixed or abnormal responses, and a stereotypical fixed lifestyle. Unusual interests and unusual ways of playing, i.e. often a special fascination with certain objects or activities, the fascinated object will be held all day, for dozens of days. Stereotyped, repetitive behavior and special postures, often pacing back and forth alone, rotating themselves, walking in circles, jumping repeatedly, the most common posture is to put their hands on their chest and stare, often appearing self-injurious, self-harm nature of the action. He also repeatedly touches smooth objects, and often sniffs objects in front of his nose, and even sniffs common objects first. Sensory and perceptual abnormalities may be weak, strong or unusual, and some children may be unresponsive to painful stimuli. Intellectual and cognitive deficits are found in about 3/4 of children with mental retardation. Some autistic children have certain special abilities, such as unusual memory for routes, numbers, place names, names of people and the ability to project and speed calculate dates.