The purpose of this study was to investigate the effect of breathing and trunk stabilization exercises on vertebral segment motion and deep lumbar muscle thickness and twenty-three patients with chronic low back pain were enrolled in this study. The patients were aged between 30 and 50 years. In the comparison group of the experimental group, both the thoracic segment angle and the lumbar segment angle were significantly increased(p<0.01)(p<0.05). and the thickness of the deep lumbar muscle was significantly increased in the muscles of the multifidus and the transvers abdominis(p<0.05). In the comparison group of the control group, both the thoracic segment angle and the lumbar segment angle were significantly increased(p<0.05). and the thickness of the deep lumbar muscle was significantly increased in the muscles of the transvers abdominis(p<0.05). In the comparison between groups, there was a significant difference only at the angle of the thoracic segment, and The deep lumbar muscle thickness differed only in the transvers abdominis(p<0.05). In the future, in order to manage patients with chronic low back pain in clinical practice, it is considered to be effective in managing patients with chronic back pain by concurrent breathing exercise in stabilization exercise.