The purpose of this study was to investigate the effect of couples art therapy applied with emotionally focused couple therapy (EFT) on the marital relationship and quality of life of a breast cancer patient and their spouse. The subjects of this study were a breast cancer patient and spouse A. Marital art therapy was performed once a week for 90-110 minutes, for a total of 12 sessions. Three Couple Scale and Quality of Life Assessment (Functional Assessment of Cancer Therapy-General, Functional Assessment of Cancer Therapy-General Population) were used as measurement tools and were compared in advance, post, and later periods, and the couple s behavior and attitude were observed according to the EFT treatment process were as reflected in the study results. The results of the study showed that marital art therapy with EFT had a positive effect on the marital relationship between the breast cancer patient and spouse and their overall quality of life. In addition, by approaching the hidden emotions behind the couple s attitudes during interactions and reorganizing them from the perspective of attachment needs, it was confirmed that the couple s interactions had changed, reorganized from negative to positive, and they formed emotional bonds. Based on these research results, the applicability of EFT in marital art therapy was confirmed, and the significance and limitations of the first marital art therapy study attempted for cancer patients and spouses are discussed.