This study aims to determine the nonverbal communication behavior of autistic children at the Jambi Province Autism Service Center, the obstacles, and the efforts made by the therapist. This research uses descriptive qualitative research with data collection obtained through interviews. The results of this study are (1) nonverbal communication behavior of autistic children seen in the therapy process such as facial expressions, eye contact, gestures, hand signals, and touch; (2) the obstacles faced in the therapy process are food factors because the nervous system will be unstable if the food consumed is not healthy, this will cause behavior in children to change, and the therapy process will not work well; (3) the efforts made are using the ABA method, communicating a lot with children and also maintaining communication with children's parents in educating children.