The purpose of this study was to examine what a child experienced and what meanings were in the process of art therapy to improve regressive behavior, alleviate depression, and instability for a non-disabled child with disabled siblings. For the study, a male child in the third grade of elementary school was selected as a research participant, and art therapy was performed by applying art-based therapist intervention for a total of 32 sessions of 100 minutes once a week from May 22, 2021, to June 25, 2022. For data collection, the sessions were qualitatively analyzed based on an in-depth understanding of data focusing on the context of specific situations, events through verbatim transcriptions of recordings, and image taking and storage. As the result of this study, 5 upper themes and 17 sub-topics were derived. Upper themes were , , , , and . Changes in emotions and thoughts experienced by child in the process of art therapy showed that the therapy helped overcome his regressive behavior and improve psychological growth with positive coping skills. Based on these results, the implications and limitations of this study were discussed.