The theoretical standpoints of ”customer loyalty” have risen since early 1990's, their connotations are applied by theoretical and actual field widely. Although what are antecedents and interval variables of it that often had been discussed in the past time empirical studies, there are not able to agree identically also. Based on a research of the industry of chain coffee dish that explores the relationships between percevied fairness (payment equity, interaction fairness and procedural fairness) and customer loyalty (word of mouth and purchase intention), to confirm whether interval variables exsit or not. The samples studied from the customers of the front 4 companies of the chain coffee dish in Taipei region. By using LISREL software to resolve the structure equation model, the results are as follow: Between percevied fairness and customer loyalty exist indirect relationship only. Customer satisfaction and commitment occupy the functions of interval role, and customer satisfaction is the antecedent of commitment.