The aim of this research is to study how the relationship investment of a leisure farm and the fairness affects tourist loyalty through the mediating effect of the three factors of relationship quality. This study targets the tourists of the Hsiao Kang leisure agriculture area and has received 269 valid samples to conduct a survey. The result of the structure equation modeling analysis shows that the measurement has good reliability and validity. Assuming the model is effective with good explaining capability, the fairness has a greater impact on satisfaction, trust, commitment and loyalty than on relationship investment. In addition, relationship quality plays part of the mediating role in the research model. Finally, this study proposes both theoretical and managerial implications based on the research results and provides recommendations for future studies.