Objective:To evaluate Wuqinxi Exercise effect on mechanics characteristic of abdominal and back muscles and pain in patients with chronic nonspecific low back pain  Methods:72 adults with chronic low back pain were randomly divided into treatment group and control group, 36 in each group. Patients in treatment group were treated with Wuqinxi Exercise while patients in control group were treated with conventional rehabilitation gymnastics. The courses of the two groups were 6 months. Scores of SF-MPQ , indexes of PT, PT/BW, AP, TW and F/E and IEMG were observed  Results:① 63 patients completed the study in which 32 patients in treatment group and 31 patients in control group.② Compared between the two groups after the teratment, there was a significant difference in SF-MPQ total score , PRI and PPI (P<0.05). ③ Compared in each group before the treatement, there was significant difference in back and abdominal isokinetic testing (P<0.05), while there was no significant difference between the two groups after treatment. ④ Compared in each group after the treatement, there was significant difference in IEMG of left obliquus externus abdominis in 30°/s (P<0.05). ⑤ There was negatively correlated in low degree between level and socere of PT/BW in 30°/s   Conclusion:Wuqinxi Exercise is a useful treatment for chronic low back pain in middle-aged people. It has more positive effect on relieve pain and improve health-related life quality that caused by chronic low back pain.