Premature ovarian insufficiency (POI) refers to the occurrence of ovarian hypofunction in women before the age of 40, which seriously affects women's overall health and quality of life. However, there is currently insufficient understanding of the risk factors, pathogenesis, short-term and long-term health effects of POI, and the health effects of the disease, and there is a lack of high-quality evidence to support clinical diagnosis and treatment decisions. This study intends to construct a hospital-based multi-center POI case-control and prospective special disease cohort, after baseline assessment and follow-up monitoring, collect disease characteristics, lifestyle, social psychology, environmental and occupational exposure, biological samples and other data, aiming to observe POI The natural occurrence, progression and health impact of POI, clarify the risk factors of POI, evaluate the impact of POI on women's health and disease risk, and discuss the benefits, risks and options of HRT for POI patients. The results of this study will deepen and expand the understanding of the occurrence and development of POI and its short-term and long-term health effects, provide high-level evidence for optimizing POI prevention, diagnosis and treatment strategies, and establish a long-term management system, laying the foundation for interventional research.