The article was substantiated necessity of evaluation of the success of social adaptation in inclusive education of children with autism spectrum disorders in the secondary school. The Childhood Autism Rating Scale (CARS) may be used as a tool of such evaluation; the article presents the results of the analysis of experimental data obtained in the research-based secondary school; proves the efficiency indicators of the dynamics of autistic symptoms for the evaluation of the success of social adaptation and for the definition of the form of teaching children with ASD in secondary school.