Following the increasing trend of global internet usage, social commerce is becoming a ubiquitous part of consumers shopping style; however, its development level is still slow and weak in some emerging market countries. Social interactions, information and experience sharing are becoming a key issue in online consumers’ purchase decision process. This dissertation aims to examine about the roles of trust and risk and their different antecedents on Mongolian people intention to purchase from web vendors. The result shows significant correlations has been found between the constructs composing the four types of trust and trust as well as risk.