Abstract: This research aimed to identify and understand the using of reparation defense mechanism, as stated by Psychoanalysis, present in a child with autism, during school interactions. A 8-year-old autistic girl was observed in school while interacting with her mediator, in a primary school in São Paulo state in Brazil. The interactions were systematically described and qualitatively analyzed, with the focus in moments when the girl made use of reparation, in clear movements of acting, blaming herself and trying to restores damages caused by her attitudes. The analysis showed that reparation, as a defense mechanism, present in many situations, can be observed even in autistic spectrum disorder children.