Background: Simulation is one of the most important resources in nursing educational trading that help in improving nurses'performance and self-confidence for decreasing maternal morbidity and mortality from Postpartum haemorrhage (PPH). Aim: this study aimed to evaluate the effect of simulation based training on maternity nurses' performance and self-confidence regarding primary post-partum haemorrhage management. Research Design: A quasi-experimental design was used. Setting: This study was conducted in Clinical Obstetric Skill lab of Faculty of Nursing, Benha University. Sample: A convenient sample of a total 65 maternity nurse who working at Obstetrical and Gynaecological Emergency Department at Benha University Hospital. Tools: Three tools were used for collecting data; 1) A structured interviewing questionnaire; it includes two parts socio demographic data and assessment of maternity nurses' knowledge regarding primary postpartum haemorrhage. 2) Maternity nurses' practice observational checklist. 3) Modified Self-confidence measurement Scale. Results: The result of the present study proved that about two thirds (61.5%) of the studied maternity nurses were aged less than 30 years with mean age of 29.6±7.62years moreover the majority of them (86.2 %) had less than 10 years of experience. It also indicates that the highest percentage (89.2%) of them hadn't previous simulation training program regarding PPH. Additionally studied maternity nurse had poor level of knowledge, unsatisfactory performance and unconfident level of self-confidence mean score regarding management of PPH before simulation training (64.6%, 78.5%, 69.2%) respectively. Yet, after the simulation training the nurses' knowledge, performance and self-confidence were significantly improved Conclusion: Hypotheses of the current study were accepted.Simulation based training had a highly significant effect on improvement nurses'performance (knowledge & practice) and self-confidence regarding primary post-partum haemorrhage management. Recommendation:Simulation based training programs should be provided for all obstetrics health care givers to help nurses to play an active role in obstetric emergencies.