Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in women of reproductive age, which may result in infertility. Because of the complicated etiology and high morbidity, it has attracted wild attention of researchers around the world. The large quantity of blood specimens that have been obtained from multicenter clinical trials (PCOSAct) are precious resources for clinical research. It could not only contain clinical data of the related diseases but also provide vital guidance for the diagnosis and treatment of the disease. This paper discusses the collection, processing, storage, and testing of blood specimens as well as the potential problems, and emphasizes the importance of specimen quality for high quality clinical research. The purpose of this paper is to provide experience and reference for the standardized construction of biobank in future and improve the management of blood specimen in clinical trials.