A retrospective study of all deliveries from 1983 to 1993 at the Tsan Yuk Hospital to evaluate the incidence was performed and outcome of eclampsia. Eclampsia occurred in 12 patients. The incidence was approximately 2 per 10 000 deliveries and was relatively constant during the study period. Most convulsions occurred during the intrapartum (41.7%) and post-partum (50.0%) periods, and about half of them had no warning signs. There were no maternal or perinatal deaths. Prophylactic anticonvulsants should be given to all patients with warning signs; however, eclampsia is not always preventable.