The proposed article presents a theoretical overview of the problem of autism and ABA therapy as a method of correction. Currently, insufficient assistance to children with autism has become a global problem. This is due to the growth, as the number of children with this disorder is growing every day. According to modern researchers, various forms of early autism occur in 1 out of 100 children. In addition, there is an increased frequency of this developmental disorder.  ABA therapy is widely known as a safe and effective correction of autism spectrum disorder. The principles and methods of applied behavior analysis can contribute to the development of basic skills in children with autism, such as communicating with people, handling, self-service, understanding words spoken face to face, as well as complex skills such as verbal speech, reading and understanding the point of view of another person (mental model). This article attempts to describe the features of applied aspects of applied behavior analysis with a theoretical justification of autism disorder and ABA therapy.