Postpartum Haemorrhage (PPH) remains a signifcant cause of maternal mortality and morbidity. This prospective cross sectional study was done at the Obstetrics and Gynaecology Department of Dhaka Medical College, Dhaka from January 2013 to July 2013. The objective is to detect the risk factor of primary postpartum haemorrhage. This study shows most of the patients (45%) belonged to 26-30 years age group. The most of the patients (88%) developed PPH after vaginal delivery whereas 12% patient developed PPH after cesarean section. Causes of PPH included atonic uterus in 57 patients, retained bits of placenta in 14 patients, cervical tear in 13 patients, vaginal tear in 9 patients and others in 8 patients (inverted uterus, ruptured uterus). Prolonged labor, grand multiparity, Pre-eclampsia/Eclampsia, multiple pregnancy, polyhydramnios, macrosomia and instrumental delivery were the common risk factors.