Objective: This study aims to explore the relationship among App football live streaming service quality,fans' online watching motivation and user loyalty. Methods: Questionnaire survey and mathematical statistics wereused to investigate football fans who watched football matches by various apps, and SPSS25.0 and AMOS24.0analysis software were used to analyze the survey data. Results: (1) App football match live service quality positivelypredicted user loyalty, football knowledge learning motivation, gambling motivation, entertainment motivation andstar-chasing motivation; Football knowledge learning motivation, gambling motivation, entertainment motivationand star chasing motivation positively predict user loyalty. (2) Football knowledge learning motivation, gamblingmotivation, entertainment motivation and star chasing motivation play a partial intermediary role between Appfootball live streaming service quality and user loyalty, that is, App football live streaming service quality can have adirect impact on user loyalty. It can also indirectly affect user loyalty through football knowledge learning motivation,gambling motivation, entertainment motivation and star chasing motivation.