With the fast development of e-commerce，online consumption is now an emerging industry. Given the spatial and temporal segregation between payment and delivery，and the anonymity of both sellers and buyers，online trustworthiness is bound to be weak. This paper uses qualitative data from interviews with online merchants and consumers to analyze how trust is constructed in online consumption. First，the paper finds that interpersonal trust in offline consumption is transformed into symbolic trust. Second，trust is no longer constructed on‘trustworthiness’but on‘untrustworthiness’. In other words，online trust is exclusive rather than inclusive. Third，the differential mode of trust in online and offline consumption varies in trustee and nexus：offline trust comes from blood-tie and other interpersonal relations while online trust depends on resource and information. Hence，the paper concludes that there is another differential mode of association in online consumption.