Abstract：Objective：To observe the clinical effect of modified Tianma Gouteng yin combined with western medicine for gestational hypertension. Methods： A total of 96 cases of patients with gestational hypertension of internal stirring of liver wind type were randomly divided into two groups. Both groups were treated with magnesium sulfate injection and labetalol hydrochloride tablets， and the observation group was additionally treated with modified Tianma Gouteng yin. Both groups were treated for seven days. Before treatment and after seven- day treatment， 24- hour ambulatory blood pressure was monitored； Chinese medicine syndrome scores were evaluated； serum indexes including superoxide dismutase(SOD)， glutathione peroxidase(GSH-PX)，total antioxidant capacity(T-AOC) and malonaldehyde(MAD) were detected. Clinical effect and incidence of adverse pregnancy outcomes were compared between the two groups. Results：After treatment，the total clinical effective rate in the observation group was higher than that in the control group(P＜0.05). The 24-hour systolic blood pressure and diastolic blood pressure in the two groups were decreased when compared with those before treatment(P＜ 0.05)，and 24-hour systolic blood pressure and diastolic blood pressure in the observation group were lower than those in the control group(P＜0.05). Chinese medicine syndrome scores in the two groups were decreased when compared with those before treatment(P＜0.05)，and the score in the observation group was lower than that in the control group(P＜0.05). SOD， GSH- PX and T- AOC in the two groups were increased when compared with those before treatment， and MAD was decreased， differences being significant(P＜0.05). SOD， GSH- PX and T- AOC in the observation group were higher than those in the control group，and MAD was lower，differences being significant(P＜0.05). The incidence of adverse pregnancy outcome was 10.42% in the observation group， lower than that of 27.08% in the control group， the difference being significant(P＜0.05). Conclusion：Based on western medicine，the additional application of modified Tianma Gouteng yin for gestational hypertension of internal stirring of liver wind type can promote blood pressure to return to normal and improve Chinese medicine syndromes，whose mechanism may be related to the improvement of oxidation mechanism of organism.