Besides the removal of lesions, the purpose of surgeries has been extended to the improvement of quality of life after procedures. Minimally invasive surgeries enabled women to experience less pain, less hospital days. It is important to maintain the ovarian function because ovarian hormones have protective effects about bone and cardiovascular diseases. Until now many operation techniques for preserving ovarian function were used in gynecological field, however, how much these methods affect on ovarian function is seldom known. For the evaluation of remained ovarian function, ultrasound examination is useful method. However, it might take several months till one can determine ovarian function and could not exactly evaluate ovarian reserve. Until now, there have been controversies regarding ovarian function after gynecological surgeries. These inconsistent results might derive from the methods for assessing ovarian function because serum gonadotropins and sex steroids levels vary according to the menstrual cycle.