Abstract：With rapid economic development and rising living standards, people are increasingly focusing on physical and mental health and spending their leisure time on activities such as spectator sports. Basketball is highly favored in Taiwan, second in popularity only to baseball. Many fans closely follow basketball and attend games in person, while some spectators enjoy matches through television and online live streams. The widespread use of smartphones has led sports brands, television stations, and online platforms to launch various sports mobile applications (apps), which have become major sources of information. The purpose of this study is to analyze the behavior of sports apps users based on the unified theory of acceptance and use of technology (UTAUT), focusing on four aspects: performance expectancy, effort expectancy, social influence, and facilitating conditions. The research subjects were app users of "NBA: Live Games & Scores". A total of 356 valid questionnaires were collected. The results indicate that the majority of users are male (298 people, 80.1%), with the largest age group being 21 to 30 years old (156 people, 41.9%). Performance expectancy, effort expectancy, and social influence all have a positive impact on actual behavior. Moreover, performance expectation, effort expectation, and social influence all have a mediating impact on behavioral intention. In conclusion, the findings of this study could provide practical insights for app developers, aligning app usage more closely with consumer needs and thereby promoting the development of sports apps. (Full text)