Objective To observe the therapeutic effect of modified Lingjiao Gouteng Decoction [decoction of Lingjiao （Cornu Saigae Tataricae） and Gouteng （Ramulus Uncariae Cum Uncis）] combined with western medicine on preeclampsia and its impact on the pregnancy outcome. Methods Fifty cases of preeclampsia were randomized into the western medicine group of 24 cases and combo therapy group of 26 cases. The western medicine group was given conventional therapy including diazepam tablet and magnesium sulfate injection

and the combo therapy group was added with Lingjiao Gouteng Decoction. Both groups were treated before childbirth or termination of pregnancy. The birth weight

neonatal Apgar score

extend gestational weeks

postpartum hemorrhage

early termination of pregnancy and severe patients less than 34-week gestation were observed in both groups. Results Comparing with the western medicine group

the birth weight was significantly heavier and the pregnancy was significantly longer （P<0.01）

while the numbers of unplanned termination of pregnancy and severe patients less than 34-week gestation were significantly smaller in the combo therapy group after termination of pregnancy （P<0.05）. There was no significant difference between groups in the neonatal Apgar score and postpartum hemorrhage after delivery （P>0.05）. Conclusion The combo therapy of modified Lingjiao Gouteng Decoction and western medicine for preeclampsia can extend gestational weeks and improve pregnancy outcome.