The aim of this study was to evaluate the effectiveness of art therapy on anxiety in the child with the diagnosis of anxiety problems in a health clinic in Tehran in 94. One child from the population based on convenience sampling was selected and the SCAS (Spence children anxiety scale) questionnaires and Structured Clinical Interview were studied. This study was a single case study as a multiple baseline. The chart and graphs was used for analysis of the data. The results showed that art therapy has a positive effect in reducing the severity of symptoms of anxiety and the percent of recovery for the patient was obtained to rate. These effects were to a large extent remain in duration of follow-up.