To explore the relationship among perceived lottery knowledge, self-efficiency and lottery playing health, this study uses questionnaires to measure 449 Chinese sport lottery buyers. The result showed that:(1) perceived lottery knowledge could significantly positively predict lottery playing health;(2) self-efficiency was positively related with rational control, negatively related with enjoyable experience, favourable socialization, and social harm(dimensions of lottery playing health);(3) self-efficiency partially mediate the effe...