In Taiwan, there are three major TV platforms: terrestrial TV, cable TV, and IPTV. When faced with various TV platforms, the consumers in Taiwan will be able to choose from many broadcasts. When a new medium emerges, there are always concerns of its displacement effects on existing media. Many studies have explored the displacement effects of newly-emerging media, and have come up with a variety of sometimes conflicting findings (Lee & Leung, 2006). This chapter aims to analyze the media platform competition, namely, the displacement effect of IPTV on cable TV. The research methods used include a literature review and a telephone survey. With regard to the telephone survey, 612 of CHT’s IPTV users were selected systematically based on the name lists provided by the service provider. In this study, while the platform displacement effect of IPTV on cable TV is clear, the statistics reveal a different result for the time displacement effect.