There has been only one study on the criminal liability of prophylactic surgeries in Taiwan; however, with the increasing popularity of genetic testing, prophylactic mastectomy and prophylactic salpingo-oophorectomy may become a medical option for women who are at high risk for hereditary breast or ovarian cancer. As such, the thesis analyzes the prophylactic mastectomy and prophylactic salpingo-oophorectomy case of Angelina Jolie and another prophylactic salpingo-oophorectomy case, the Shin Kong Insurance case. By analyzing the verdicts on prophylactic surgeries in Taiwan and integrating relevant domestic and foreign studies and literature, the thesis provides insights to analyze when a physician who performs prophylactic mastectomy and prophylactic salpingo-oophorectomy in Taiwan could be justified on account of proper behavior of occupation.