The purpose of the present study was to examine the effects of chiropractic treatment and/or training to reinforce the trunk position on spinal posture (X-ray, Formetric II) and function (Isometric muscle power, VAS, Interleukin-6, TNF-α). For the purpose of this study, we perform chiropractic treatment and/or Abs & back training to elite badminton player with chronic low back pain (CLP). All subjects were divided into two groups (chiropratic group or chiropractic and core training group). Treatments were applied for 2week (6 time/each week-1). According to spinal posture, pelvis width and height (X-ray) were significantly different after treatments in both groups(p<.01). Both groups have a remarkable decrease of VAS and significant increase of trunk isometric power (extension, flection p<.01). Furthermore, chiropractic treatment and/or core training led to reduction of serum TNF-α (p<.05). These results show that chiropractic treatment and/or core training has ability of reinforce the spinal posture and function, which can improve performance in badminton player with CLP.