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Background: The purpose of this study was to investigate the effects of Progressive muscle relaxation training on pain, Korean version of Oswestry disability index (ODI) and psychological level in chronic low back pain patients with somatization. Methods: A total of 30 subjects were treated with the experimental group (n=15) and conservative physical therapy (n=15). The experimental group was trained with progressive muscle relaxation (PMR), and the control group was treated with conservative physical therapy. Physical factor treatment was applied for 60 minutes by hot pack, electrotherapy and ultrasound. Both groups performed three times a week for six weeks. VAS, ODI, psychological level measurements were taken before and after intervention. Results: There was a significant difference in VAS (p<.05) and ODI (p<.01) between experimental and control group. At the psychological level, there were significant differences in somatization (p<0.01) and depression scales (p<.01), but not in anxiety. Conclusion: As a result of this study, the degree of pain was decreased, the level of back pain dysfunction was improved, and the somatization scale and depression scale were decreased by gradual muscle relaxation therapy.