Objectives: Study on the value of the Doppler resistance index of umbilical artery and its correlation to predict fetal distress associated with preeclampsia. Methods: 102 patients with pre-eclampsia at Obs. & Gyn. Department - Hue Central Hospital were taken by an prospective cohort study. Results: Mean of RI was 0.60 +/- 0.13 (0.35 - 1.0, 95 percent CI), Group I: 60.8 percent, Group II: 34.3 percent and group III, IV: 4.9 percent. At the cut-off point RI = 0.62, the value of prediction of IUGR with sensitive index was 68.2 percent, specificity index was 76.2, positive predictive value was 76.2 percent, negative predictive value was 87.7 percent, UAC was 0.649. Conclusion: The doppler resistance index of umbilical artery was the most value in predicting fetal distress.