There are great challenges in the treatment of autism. In order to assess the efficacy of intercessory prayer on symptoms improvement in autistic children, we designed a randomized clinical trial (RCT) in 30 children with autism described in DSM-4 and ICD-10. The study population will be randomized into intervention and control groups. Both groups will receive the routine therapies. The intervention group will also receive the intervention including two months of intercessory prayer by 5 physicians. Standardized measures including: 1.Gilliam Autism Rating Scales (GARS) Questionnaire 2.Autism Treatment Evaluation Checklist 3.autims social skills profile 4. Parental stress index questionnaire; will be used to assess the efficacy of intercessory prayer treatment on improvement of the autism symptoms, as well as the parental stress level.