The paper discusses non verbal behavior performed and exploited by a teacher of children with autism as part of multimodal interaction in transferring knowledge. Data were collected from one teaching session carried out by a teacher and five children with autism. Data in the forms of body language, facial gesture, proximity, kinesics and other aspects of non verbal behavior were collected from such a session. The results show that strategies in exploiting non verbal aspects of the interaction are influenced by the autistic conditions of the children. As each of students in the class has different conditions, the teacher should design different non verbal approaches in transferring the knowledge to the children. In general, the teacher always equipped her utterances with body movements, facial gestures, standing position as well as paralinguistic resources such as intonation and loudness of speech. The strategies are performed to support the verbal behavior the teacher has in the teaching session and both represent multimodal interaction in the session. It is expected that the results of this research can be good benefits for other teachers or parents of children with autism in the process of assisting the children.