Abstract: Literature review and logical analysis are adopted to elucidate the theoretical connotations of the "trickle-down effect" of large-scale sports events, systematically exploring its generation mechanism and the practical challenges faced by China in leveraging large-scale sports events to promote public sports participation. The study identifies athlete role modeling, sporting success, the festival effect of events, the upgrading of sports facilities, and the development and utilization of event resources as the core factors driving the "trickle-down effect" of large-scale sports events. However, in the practical context of promoting public sports participation through large-scale sports events in China, challenges persist, including the over-commercialization of athlete role models, the limited manifestation of the festival effect, insufficient planning for post-event venue utilization, and a lag in leveraging event resources to foster sports participation. Moving forward, efforts should focus on both pre-event planning and post-event utilization of sports venues to expand public access to sports; adopt a development-oriented mindset for major events to maximize participation benefits; enhance the interaction between athletes and the public to strengthen the role modeling effect of athletes; emphasize the creation of festive atmospheres and experiences to integrate sports events into daily life; and balance the psychological effects of competitive sports achievements to cultivate a rational perspective on the gains and losses in competitive sports. These measures aim to ensure that the "trickle-down effect" of large-scale sports events becomes more sustained, stable and effective.