The purpose of this study was to investigate the effects of mands and tacts training by Applications of Verbal Behavior Analysis on children with autism spectrum disorders in unstructured environment. A focus of this study is changes in the frequency of the speech utterance of two child each chronological age of 15 years, 7-year-old with autism spectrum disorders. The configuration of the program, a total of four phases. Intervention took place in the clinic is twice a week during 14 sessions. Dependent variables were the records of the main caregiver for the number of emission frequency of mands and tacts in the unstructured home. The results showed that the study subjects were increased in emission of mands and tacts. finally, mands and tacts training is positive impact on children with autism spectrum disorders.