I. Definition Autism Spectrum Disorder (ASD), or Autism Spectrum Disorder (ASD) for short. Important to note: Autism is a disorder with a biological basis, a congenital neurodevelopmental disorder, not a psychological disorder, and not a consequence of poor parenting. Treatment for individuals with autism requires educational training and lifelong support. There is no specific drug treatment. II.Epidemiology of autism Before 1985 it was considered a rare disease with a prevalence of 2-4/million; after 1985 the prevalence gradually increased; since 2000 countries have reported a gradual increase in prevalence; -2014, 1.5% in the United States; -2014, 2.6% in South Korea. Third, the manifestations of autism Social communication disorders. Including social interaction disorders, verbal disorders and nonverbal communication disorders; narrow interests and repetitive stereotyped behaviors; abnormalities of sensory organs. The main manifestations are: lack of proper behavior in the early stage and abnormal behavior in the later stage! IV. Intelligence of children with autism 1. 30%-35% of children are intellectually backward, more than half are normal or overachieving; 2. excellent mechanical memory; 3. musical, drawing and artistic abilities; 4. interests and abilities in the field of science, a few have special abilities in one or several areas; 5. significant abnormalities in the intellectual structure of children within the normal range of intelligence, usually PIQ>VIQ (Asperger’s syndrome usually VIQ> PIQ); V. Diagnosis of autism Diagnosis of autism can be based on DSM-V as the criteria. It is not difficult to diagnose autism clinically based on typical clinical manifestations. However, there are no specific laboratory diagnostic tools. CT, MRI, SPECT, PET, EEG, chromosomal, evoked potentials and other tests can help in differential diagnosis. It is important to note: autism does not need to wait for a diagnosis before early intervention! Normal: Able to interact appropriately with others; Mild: Able to initiate social interaction, but with significant deficits in interaction skills (requires some support); Moderate: Passive social interaction and communication (requires support); Severe: Little to no social interaction and communication (requires significant support and training).