Symptoms of autism usually appear before the age of 3 years, and many manifest abnormalities shortly after birth. About 1/3-1/2 develop essentially normally in the first 1 or 2 years of life and abnormally later. The basic features of autism are social interaction disorder, speech and language disorder, narrow range of interests and rigid behavioral patterns. 1.Social interaction disorder: Many children in infancy show avoidance of eye-to-eye gaze, lack of facial expressions, lack of emotion towards parents, reluctance to be picked up, and no sense of attachment. They prefer to play alone and do not interact with other children. The child is not interested in normal children’s preferences, but is particularly interested in certain things, such as a stone, and cannot leave it at any time. 2. Speech disorders: Children with speech disorders have little or no speech, some are speechless from childhood, others have speech before the age of 2-3, but later the words they can speak gradually decrease or even lose. Some children do not talk to others, talk to themselves, or say inexplicable words, and at the age of 4 or 5, they still cannot distinguish between “you, me, and him”. Repeats and imitates speech, sometimes screaming for no reason. Does not use gestures, postures or expressions to express his or her demands or attitudes. 3. Stereotypical behavior: Stubbornly insisting on their own behavior, unwilling or refusing to change, such as going out to a certain route and not detouring when encountering obstacles or standing water. Behavior is stereotypical and repetitive, often making special movements such as spinning, clapping, swaying back and forth, and even self-injurious and self-harming behaviors such as head-banging and hand biting. 4.Sensory perception disorder: the child can show abnormalities to various stimuli, too strong, too weak or have unusual experiences. The sensory retardation can be unresponsive to pain, “hearing but not hearing”, “seeing but not seeing”, and not dizzy for a long time. Those with sensory sensitivities, such as sensitivity to light, become irritable and cover their ears when they hear a slightly loud sound. 5. Intellectual disability: 3/4 of children with autism have low intellectual ability, and their ability to adapt and take care of themselves is generally low. Some children with autism have some kind of extraordinary ability in the background of low intellectual ability, such as recitation, literacy, name memorization, counting, projection, strong sense of music, etc. They are called “idiot scholars”. There is no single specific treatment for autism in children, but a comprehensive treatment based on training and supplemented by medication is used.