Liu Haiyi from Tongji, Wuhan studied at Tongji Medical University. Liu Haiyi 1992 studied clinical medicine at Tongji Medical University, and began to work in tongji hospital Obstetrics and Gynecology Department in 2000. 20 1 1-20 13 went to Germany for further study. Engaged in clinical work in obstetrics and gynecology, successively served as resident, attending physician and deputy chief physician, and independently completed various gynecological routine operations such as cesarean section, total hysterectomy, laparoscopic salpingectomy and cyst stripping. 500-600 cases of cesarean section are completed every year.