Autisme is an interference developing of brain function that effect to social interaction and communication skill, the symptom of autis appear before a child is three years old. One of the type of therapy can reduce autis behavior is diet gluten free casein free (GFCF) which is avoid foods that contain both of gluten and casein. This research aims to know abedience of parents to apply diet GFCF to autis children. This research uses a description approach with quantitative methods. Collecting of data is interview whith 12 mothers of autis children, 4 family/caregivers and 3 therapist. Most of parents who khow diet GFCF are difficult to apply, so that it effects for the child’s behavior such as anger, screaming, hyperactivity, and difficulty in interacting not only at home but also at the therapy site. Many factors that can cause diet failure such us lack of control from parents, feeling of pity, and parents who do not want to bother. Application of the diet gluten free and casein free is very influence to develop autis child specially reduce autistic compatibility, so that the role of parents and environment are necessary to implement the diet gluten free casein free.

Keywords : Autisme, compliance of parent, GFCF