Background: Postpartum readmission rate has been increasing after both caesarean and vaginal delivery. Postpartum diseases, in some cases with infection and anemia, result in hospital readmission. Also it raises the issue associated with maternal hospital’s healthcare quality. There has lack of study focusing on postpartum readmission. So we will study postpartum readmission rate. Material and Methods: 112 patients who readmitted in Amgalan maternity hospital in Ulaanbaatar were involved in this study. We used patient’s medical history to determine risk factors resulted in hospital readmission after caesarean and vaginal therapy. Results: The mean age of women delivered by cesarean was 30.2±7.32 and vaginal delivery’s was 28.3±7.21. 34.8 percent of women who readmitted after vaginal delivery had 1-3 readmission days and 56.5 percent was 4-6 days and 8.7 percent was 7-10 days. Readmission day for women delivered by caesarean was 1-3 days in 21.2 percent of these, 4-6 days in 56.1 percent and 7-10 days in 19.7 percent. The mean readmission day of women delivered by vaginal delivery was 4.73±1.61 (mean±SD) and the mean of women delivered by caesarean delivery was 5.54±2.34 (mean±SD). In each category, there had 24.2-28.3 percent cases with lochia. Women who had caesarian delivery were infected their scar with 24(36.3) cases. Renal urinary system infection had in 12(26.0) women delivered by vaginal delivery. Conclusion 58.9 percent of total readmissions cases were caesarean and 41.1 percent was vaginal delivery. Lochia and renal urinary infection had influence in readmission after vaginal delivery. Also both lochia and infected wound impacted on postpartum readmission after caesarian delivery.