Objective: To investigate the clinical outcomes and safety in patients with lumbar disk herniation(LDH) treated with collagenase and ozone.Methods: A total of 129 patients with LDH were divided into group A and B,received injection of collagenase and ozone or collagenase respectively.The effect was assessed 1 week,3 months,6 months after treatment.Results: Most patients had a remission of pain,regardless of the treatment.The follow up outcomes in group A were better than those in group B during the same period.Conclusion: Chemonucleolysis with collagenase and ozone has a cumulative effect in the treatment of LDH.