This research aims to investigate endorsement effect, brand love, and brand loyalty. Taking NBA fans as target subject and applying balance theory to explain the relation among the endorsement effect of star players, fans’ brand love, and fans’ brand loyalty. On-line questionnaire was utilized for collecting data. 302 valid questionnaires were included to conduct descriptive statistics, reliability analysis and regression analysis. According to the results, we can confirm the proposed hypotheses. Eventually, the suggestions were provided to the marketers of sports brand.