Consumer's consumption is obviously reduced due to the economic slump. The entire hypermarket industry is also influenced. However, the sale of the Costco Wholesale in Taiwan still grows up stably. This study is thus to explore Costco's management model and strategy by examining the relationship among store image, service quality and customers loyalty of Costco. Based on the 363 questionnaires, the results indicate: (1) customers loyalty would be significantly positive affected by store image and service quality; (2) customers value would have the mediate effects on store image, service quality and customers loyalty.