Objective To reveal the influence of different type lumbar disc disorders(T11-S1)to lumbar curvatureby analyzing of the cases suffering lumbar curvature straightening. Method Retrospective analysis of lumbar disc disorder including degeneration, protrusion and intervertebral space narrowing in T11-S1 were made in curvature straighten group(69 cases)and control group(the same age with normal lumbar curvature,41 cases),respectively. The statistical analysis was given to the different incidence of some parts of disc disorder between two group. Result The incidences of disc disorder in T11-L2 including degeneration, protrusion and intervertebral space narrowing are very low both in curvature straighten group and control group, however, the incidence occurred in L2-S1 increase obviously, especially in curvature straighten group. In segment of L2-S1, the incidence of disc degeneration, protrusion and intervertebral space narrowing in lumbar curvature straighten group is higher than that of control group (P<0.05或P<0.001) except the disc degeneration and protrusion of L2-3 (P>0.05). Conclusion The incidence of lumbar disc affection in L2-S1 increase obviously among the patients suffering with lumbar curvature straighten and, shows that the disc disorder as the local factor may be the motivation led to lumbar curvature straighten.