Background: Ectopic pregnancy accounts for 1-2 percent of all pregnancies and a certain proportion of maternal death. The incidence of ectopic pregnancies has seen more than 3-fold increase over the last 20 years. In 2004, around 70000 women in the United States were diagnosed with ectopic pregnancy and it is one for every 250 pregnant women². Ectopic pregnancy case in South Korea is 17.3 per 1000 pregnant women⁹. In Ireland, the prevalence of the ectopic pregnancy increased from 12.8 per 1000 births in 2005 to 17.1 per 1,000 births in 2016⁸. According to the MCHR study in Mongolia, 2.4% of total pregnant women was reported in maternal death. In Ulaanbaatar, 1.3% of the inpatient women were treated due to ectopic pregnancy and 33.7% of gynecologic surgical patients were women with ectopic pregnancy. In 2005, 171 women were hospitalized for ectopic pregnancy and this increased to 647 in 2015⁷. Incidence of ectopic pregnancy is increasing each year, but this type of comprehensive survey is not enough to provide a basis for selecting the subject. The objective of the study is to study the medical history of inpatient admissions with ectopic pregnancy, retrospectively. Methods: The present retrospective study was carried out through a retrospective database analysis. We studied each patient’s history; total of 615 cases of ectopic pregnancy hospitalized in the Urguu Maternity Hospital, using 5 sections of questionnaires with of 48 questions, between 1 January 2015 and 1 January 2016. We used the Statistical Package for the Social Sciences (SPSS) 20 for data processing and estimation of survey findings. Conclusion As a result of this study, the highest rate of ectopic pregnancy is 3.8/100 and the highest incidence of ectopic pregnancy was found among women aged 25-35 years, the youngest patient was 19 and the oldest patient was 49, respectively. A 38.6% of women who diagnosed with ectopic pregnancies had to have abortions, 13% had miscarriage, 42.1% had history of vaginal surgery and 32.6% had history of uterine surgery which is most common causes of ectopic pregnancy.