Abstract: As an important factor in market opportunity information searching, the social network has received more and more attention in the research and practice. In order to improve enterprise’s ability for market opportunity information searching, the Enterprise’s Social Network for Searching Market Opportunity Information (ESNSMOI) is examinecl based on the social network theory. The characteristics of ESNSMOI are analyzed. Moreover, four types of ESNSMOI are classified and their functions and structures are analyzed and compared with. Finally, These ESNSMOI features of a bank are further discussed based on a case study.