The research adopts content analysis, Delphi method to study the research status of online trust in foreign countries from the year of 2000 to 2012, which makes an overall review on the influential factors of online trust, the structure of online trust and the consequences of online trust. The conclusions are as follows: firstly, the influential factors of online trust are respectively the characteristics of the one who trusts, the one who is trusted and the characteristics of communication media. Secondly, the structure of online trust is multidimensional, which constitutes integrity, sincerity and ability. Thirdly, different online activities lead to different influence. But the common thing is that trust affects the attitudes and manners of the person who gives trust. Fourthly, the study on online trust has made great progress, but it also needs improvement.