Objective：To observe the clinical effect of modified Banxia Baizhu Tianma tang for cervical spondylosis of vertebral artery type with syndrome of phlegm-heat harassing the interior in young and middle-aged patients.M e th o d s：Randomly divided 80 cases of young and middle-aged patients admitted in the hospital with cervical spondylosis of vertebral artery type with syndrome of phlegm-heat harassing the interior into two groups，40 cases in each group.The observation group was treated with modified Banxia Baizhu Tianma tang，while the control group was given flunarizine tablets for treatment.The treatment of the two groups lasted for two weeks.Observed and compared the clinical effect and the improvement of the maximum velocity and average velocity of basilar artery and bilateral vertebral artery in the two groups.Results：Compared the clinical effect in the two groups，the total effective rate was 90.0%in the control group，higher than that of 75.0%in the observation group，the difference being significant(P ＜ 0.05).After treatment，the blood flow parameters of transcranial doppler as the maximum velocity of left vertebral artery(LVA-Vs)，the average velocity of left vertebral artery(LVA-Vm)，the maximum velocity of right vertebral artery(RVA-Vs)，the average velocity of right vertebral artery(RVA-Vm)and the average velocity of basilar artery(BA-Vm)in the observation group were all increased when compared with those before treatment，differences being significant(P ＜ 0.05).Compared the above indexes in the observation group with those in the control group respectively，differences were significant(P ＜ 0.05).Conclusion：Banxia Baizhu Tianma tang has good clinical effect in treating cervical spondylosis of vertebral artery type in young and middle-aged patients，which can improve the maximum velocity and average velocity of basilar artery and bilateral vertebral artery.