${ulcorner}$Hwang;Jae;Nai;Kyung${lrcorner}$ is the greatest and oldest book on oriental medicine. It contains all the basic theories of oriental medicine. OB&GY in oriental medicine have been developed on the foundation of ${ulcorner}$Hwang;Jae;Nai;Kyung${lrcorner}$. However no intensive gynecological studies on ${ulcorner}$Hwang;Jae;Nai;Kyung${lrcorner}$ has been performed to this day. Hereupon, an investigation on OB&GY in Hwang Jae Nai Kyung is done for future theory and clinical study. The phrases that contain OB&GY are totally 24 in the chapter 16 of Somun and total of 9 in the chapter 8 of Youngchu. Phrases dealing with pregnancy were total of 9, which was the most frequent. Also statements about amenorrhea, lower abdominal pain, bleeding, discharge, menstruation, jangdam, sukga, postpartum, infertility were found. Hence, more studies of OB&GY in ${ulcorner}$Hwang;Jae;Nai;Kyung${lrcorner}$ is needed in order to verify and apply the theories stated in ${ulcorner}$Hwang;Jae;Nai;Kyung${lrcorner}$.