Abstract: To further reveal the influence mechanism of leisure sports on well-being of the elderly people, the self-efficacy and flow experience were applied as mediating variables, and the structural equation model method was used to study the happiness of senior people who participated in the square dance. The results find that:Leisure involvement has a significantly positive impact on self-efficacy, flow experience and well-being; The significantly positive impact of self-efficacy on flow experience and the impact of flow experience on wellbeing are supported; Flow experience has a partial mediating role in the positive impact of leisure involvement on well-being; Self-efficacy also has a mediating effect, but it has indirect impact on well-being only when working with flow experience.