Purpose : The purpose of this paper is to report the effect of oriental medicine to primary infertility caused by uterus unicornis. Methods : The patient in this case, 30 years-old female was treated with herb medication(Sosihotang, Gyejibokryeonghwan) for one month. Before oriental treatment, she had been diagnosed as primary infertility caused by uterus unicornis in Samsung Cheil Hospital and treated medication and injection for IUI(intrauterine insemination) in 2 times. But she had failed in gestation. Results : After taking herb medication she became pregnant. Conclusion : According to this result, we concluded that herb medication could improve fertility rate. After this paper, further study and clinical approach based on oriental medicine will be needed about infertility caused by uterus unicornis.