Four multiplexes in Seoul, which played a standard role of multiplex industry, were studied. And this study conducted questionnaire survey of people in their 20s-30s who had ever been to the above selected multiplexes(CGV, Mega box, Lotte cinema, Cinus) as well as other ones. Through convenience sampling survey, this study tried to examine substantial competitiveness and preference of multiplex movie theater industry, which held a key post in the leisure activity. The main positive results were as follows. First, the comparative method of similarities showed that there was strong competition between CGV and Mega box, while relatively weak one between Lotte cinema and Cinus. Second, competitive dominance of multiplexes on significant 8 factors among 16 evaluate ones revealed that CGV was first, followed by Mega box, Lotte cinema and Cinus, and this was same conclusion on a question, which is the most ideal multiplex. Third, respondents answered that the most ideal evaluate factors of multiplexes were 'playing movies in various show times', followed by 'releasing movie of various genres' and 'comfortable seats with find view'.