Aims:To examine the factors influencing compassion fatigue and compassion satisfaction in obstetrics and gynaecology nurses and to explore the combined results of multiple factors.Design: An online cross-sectional study was conducted.Review Methods: Data were collected from 311 nurses using a convenience sampling method from January to February 2022. Stepwise multiple linear regression analysis and mediation tests were performed.Results: Compassion fatigue in obstetrics and gynaecology nurses was in the moderate to high levels. Physical status, number of children, emotional labour, lack of professional efficacy, emotional exhaustion and the none-only-child can influence compassion fatigue; lack of professional efficacy, cynicism, social support, work experience, employment status and night shift were predictive of compassion satisfaction.Social support partially mediated between lack of professional efficacy and compassion fatigue/compassion satisfaction; emotional labour moderated in the mediated analysis model. Conclusion:Moderate to high levels of compassion fatigue was present in 75.88% of obstetrics and gynaecology nurses. Some factors affect compassion fatigue and compassion satisfaction. Thus, nursing managers should consider factors and construct a monitoring system to reduce compassion fatigue and improve compassion satisfaction. Implications for the Profession:The results will provide a theoretical basis for improving job satisfaction and the quality of care in obstetrics and gynaecology nurses. And this may raise concerns about the occupational health of obstetrics and gynaecology nurses in China. Reporting Method:The study was reported according to the STROBE.