This paper's purpose is to review researches about interactions of developmental disordered children in classrooms, and discuss the tasks of research. In Japan, special support education is advanced from 2003, and education for developmental disordered children became more important even in ordinary schools and ordinary classes. In preceding studies in the fields of education for disorder children and psychology, interactions are looked on one of social skills in which most developmental children are weak, and the progress of interaction is one of purposes. Recently social inclusion or inclusive education is aimed, therefore how to treat developmental disordered children in classrooms became big issues as well as how to teach each disordered children by the method fitting in each disorder. So we need to describe interactions in classrooms by ethnographical way.