Objectives： To observe the clinical effect of modified Xiantian Dingkun tang for lumbar disc herniation.Methods：Divided 90 cases of patients with lumbar disc herniation into the control group and the treatment group randomly，45 cases in each group.The control group was given routine therapy and electroacupuncture for treatment，while the treatment group was given modified Xiantian Dingkun tang based on the treatment of the control group.The treatment lasted for four courses，which covered one week in one course.Compared the clinical effect after treatment and observed score changes of visual analogue scales(VAS)before and after treatment in the two groups.Results：The cure rate was 71.11%and the total effective rate was 100%in the treatment group，while the cure rate was 40.00%and the total effective rate was 84.44%in the control group，differences being significant(P ＜ 0.01，P ＜ 0.05).Before treatment，no significant difference was found in the comparisons of VAS score between the two groups(P＜ 0.05).After treatment，score of VAS in the two groups were decreased when compared with those before treatment，differences being significant(P ＜ 0.01).VAS score in the treatment group were lower than those in the control group，difference being significant(P＜ 0.01).Conclusion：Based on the routine treatment and electroacupuncture，the therapy of modified Xiantian Dingkun tang has significant effect in treating lumbar disc herniation.