This study is an interventional, single-arm, open-label clinical trial. To evaluate the safety and efficacy of Fluzoparib as neoadjuvant therapy in patients with FIGO stage III and IV , BRCA mutations or HRD positive epithelial ovarian cancer who cannot achieve R0 surgery as assessed by imaging (Suidan's CT score) or laparoscopy (Fagotti score), or cannot tolerate surgery.