This study mainly explored the relation between relationship investment and relationship quality. Farmer associations in Taiwan were selected for study. In total, 314 valid questionnaires were received during the survey. The results indicate that the measurement used was reliable and valid. The proposed model is also valid and has a high explaining power. The relation between relationship investment and relationship quality is strongly significant. Interpersonal communication is a better predictor for relationship quality and has a higher impact on customer satisfaction. Finally, theoretical applications and managerial applications are offered based on the results of our study.