Abstract: Today, the issue of keeping and strengthening customer loyalty is considered as a strategic challenge for the companies which are concerned how to retain and develop their competitive position in the market. They bear high costs to understand this concept and to achieve the practical approaches to strengthen it; because as the competition is intensified and the quantitative and qualitative level of the services in the selection area of the customers, it is considered as a vital task to provide the services which would be able to attract their attention and change them into the permanent customers of the services provided by the organization. The present investigation examines the quality system, information quality, interface design quality and their effects on the satisfaction and trust of the customers of websites as well as the effects of such trust and satisfaction on loyalty of customers of websites. Statistical population of this research includes the customers of Center Market website among which a sample of 320 people was selected. The data were analyzed using SPSS and AMOS statistical software and the Structural Equation Modeling (SEM) was used as the statistical method. The results so achieved show that system quality and interface design quality affect significantly on the satisfaction and trust of the customers. Furthermore, the trust and satisfaction are considerably effective on the customer loyalty
