This study investigates "commitment" , which is the crucial variable in the study of relationship marketing, because I pay attention to the importance of relationship marketing toward consumers in virtual environment. This dissertation whose main issue is about virtual environment focuses on "commitment" from two perspectives. One is customers′ relationship commitment toward enterprises or corporations through internet sites and the other is relationship commitment between customers. The main purpose is to verify antecedents and consequents which influence relationship commitment toward internet sites (corporations or enterprises) and between customers. The hypotheses are that (1) share values and relationship benefit from internet sites affect relationship commitment toward internet sites (2) share values and interactions between customers affect relationship commitment between customers (3) interactions with relationship commitments toward internet sites and between customers exist (4) these relationship commitments affect future intentions. The subjects are university students who I think get used to using internet. The results indicate that (1) antecedents of relationship commitment toward internet sites and between customers are significantly influential (2) relationship commitment toward internet sites influences relationship commitment between customers, but the effect of relationship commitment between customers on relationship commitment toward internet sites is not significant (3) relationship commitment between customers influences future intentions, but the effect of relationship commitment toward internet sites on future intentions is not significant.