Improving the social interaction of children with autism is one of the significant factors to be considered in the autism children's behavioural territory. The most vital factor in strengthening social interactions in spaces is the existence of a desirable area for these children. The purpose of this study was establishing a place while preserving their territory for promoting the quality of social interactions of children with autism. Thus, the factors affecting the concept of territory in the autism children's behaviour base was analysed. Two autistic centres of Tehran were selected to test the results. The research method was mixed i.e. both quantitative and qualitative methods were examined in this paper. The results suggest that the desirable territory in the autism children's Behavioural setting is as a manifestation of their social interactions and must meet their social needs and pave the way for accessing and providing the services they need. Moreover, it should bring about the conditions, so that social interactions are continuously established among these children. Thus, the study focused on some aspects such as territory, so that while revealing their significance in the autistic children's Behavioural setting, present some solutions for the practical application of such concepts in designs.