The purpose of this research is determines the best strategies for an international medical service and the ways to maintain competitive advantages. In the fast developing and strictly competitive markets, the medical service industry can survive only when it keeps its competitive advantages. Many managers often define competitive advantages too narrowly. They consider that only marketing can increase a competitive advantage. Through analyzing of five powers we can create competitive advantage strategies that have a customer value. This can result in patients actively entering the hospital and thus reaching the goal of providing an international medical service. This research is based on article analysis to construct a common five powers in international medical services. We use the method of personal interviews to obtain the analysis of five powers which help to achieve the competitive advantage strategies. From the Taiwanese medical tourism system, we take some leading enterprises with competitive advantages as targets for this interviewing. Through the interviews regarding ?Medical service internationalization and competitive advantages?, we can further understand how the performances can be achieved in this situation of saving costs and maintaining competitive advantages on international medical services. In this study we analyze the ordinary competitive advantage strategies used to promote research positions that provide concrete measures of the unique advantages for the medical service industry. Hopefully, it will provide a references to those who want to push forward international administration.