Abstract： Objective　To investigate the incidence of pregnancy induced hypertention (PIH) in Shanghai during 1989～1998. Methods　The data were analyzed retrospectively from three municipal general hospitals and five special hospitals obstetrics and gynecology. Results　There were 158 790 deliveries in ten years. The total numbers of PIH were 8 852 cases. The incidence of PIH was 5.57%. The rate of mild, moderate and severe PIH was 55.83%, 29.39%, and 14.78% respectively. There were 114 cases (1.29%) complicated with eclampsia. The rate of cesarean section was 66.97% in PIH patients. The complications of PIH were as following: abruptio of Placenta 0.52%, heart failure 0.34%, renal failure 0.20%,DIC 0.07% hemolysis，elevated liver enzymes and low platelet count（HELLP） syndrome 0.03%, maternal death one case. There were 9 197 birth of 8 852 cases of PIH (twin 343 cases, triplets one cases).The perinatal death 66 occurred in cases (7.18‰) in which fetal death 48 cases, stillbirth 12 and neonatal death 6. Conclusion　The incidence of PIH and the rate of perinatal infant death can be reduced by strengthen antenatal monitoring, prevention, early diagnosis and treatment of PIH.