Background & aim: One of the emergencies of pregnancy is preeclampsia and eclampsia, which due to its complications, rapid diagnosis and treatment of these diseases is recommended. Preeclampsia is the third leading cause of maternal mortality in the world. Timely identification of this disorders and its risk factors in different areas can be useful in diagnosing, treating, and preventing its complications. The aim of this study was to determine the prevalence of preeclampsia, eclampsia and related factors in pregnant women who referred to the maternity ward of Imam Sajjad Hospital in Yasuj. Methods: This is a cross-sectional descriptive study. The study population is pregnant women who referred to the maternity ward of Imam Sajjad Hospital in Yasuj in 2016. All pregnant women who had been admitted to Imam Sajjad Hospital, Yasuj, from April 2016 to the end of March 2017 with pre-eclampsia, had entry criteria that included: visits by a gynecologist, routine maternity care and Laboratory diagnostic tests were performed and after registering their profile, parameters related to their condition including complications of preeclampsia, clinical condition, recovery, and other items needed to achieve the goals of the study were recorded from the records of doctors and observations of doctors and nurses. Collected data was analyzed using Chi-square, Accurate and Fisher tests. Results: The prevalence of pre-eclampsia was estimated to be 4. 9%. No significant relationship was seen between the prevalence of preeclampsia, previous history of preeclampsia and blood pressure (p=0. 07). It was also revealed that the prevalence of preeclampsia was higher in women with the first pregnancy and it decreases with increasing number of pregnancies. The result of this study indicated that the prevalence of cesarean section with preeclampsia is higher than in normal delivery. Conclusion: The prevalence of preeclampsia in Yasuj was 4. 92. it was concluded that the preeclampsia prevalence in Yasuj in 2016 is similar to that of the studies conducted around the world and our country. Although, it seems that hospitalization of pregnant mothers due to preeclampsia is not concern among other problems. Due to prevalence of preeclampsia and its complications and since prevention of this disorder is not currently possible in pregnant women therefore, timely and appropriate care should be taken during pregnancy for diagnosis in time and prevent adverse effects.