Objective： To observe the clinical effect of Dingxuan pills for posterior circulation ischemic vertigo of liver-kidney yin deficiency type.Methods：Selected 200 cases of patients with posterior circulation ischemic vertigo of liver-kidney yin deficiency type and divided theminto the controlgroup and the treatment group randomly，100 cases in each group.The two groups received the routine control of dangerous factors.The controlgroup received betahistinemesilate tablets combined with flunarizine hydrochloride capsules for treatment，while the treatment group received Dingxuan pills.The two groups were treated for 28 days.Compared the clinical effect，scores of Chinese medicine syndrome and blood flow velocity detected by transcranial Doppler before and after treatment in the two groups.Results：After treatment，the total effective rate was 89.00%in the treatment group and 52.00%in the controlgroup，the difference being significant( P ＜0.05).Scores of Chinesemedicine syndrome in the two groups were decreased when compared with those before treatment( P ＜0.05)，and the decrease in the treatment group was more obvious than that in the control group( P ＜0.05).The blood flow velocity of vertebralartery and basilar artery in the two groups were increased when compared with those before treatment( P ＜0.05)，and the increase in the treatment group was more obvious than that in the control group( P ＜0.05).Conclusion：The therapy of Dingxuan pills for posterior circulation ischemic vertigo of liver-kidney yin deficiency type can improve the clinical symptoms，blood flow velocity and quality of life of patients，which is an effective method to treat posterior circulation ischemic vertigo of liver-kidney yin deficiency type.