【正文】 g opinion leaders. In recent work,work based marketing and viral marketing has proven to be more costeffective than traditional direct marketing, which treats the customer as an independent decision maker and ignores the effect of the surrounding work. The premise of viral marketing is that targeting a few influential consumers initially can trigger a cascade of influence through a social work in which friends will voluntarily share their experiences or remend the product to other friends . Thus, a panycan avoid marketing directly to a consumer who is largely influenced by friends, and is not very likely to buy a product unless remended by friends. Therefore, constructing a social work using interactions between consumers and finding the important nodes, .,influential customers in the constructed social work has been a key issue for marketers as well as sociologists for some time. Many kinds of centrality measures have been developed, . degree centrality, which treats high degree nodes as important and distance centrality, which treats nodes with short paths to many other nodes as important. Some online munities such as encourage users to provide trust data, where users explicitly express their trust of other participants, leading to the construction of personalized webs of trust. Many Emerce websites such as allow a consumer to buy a product as a gift for friends and to remend it to friends. Consumers write product reviews and also express how useful the reviews written by other consumers are. However, in general, most socialworks are formed and maintained through informal, qualitative and unobserved interaction and thus it is difficult to find a social work in Emerce websites. Few researchers have studied how social influence propagates in Emerce websites and how to use it for influencing customers’ decision making in research has focused on identifying social works in web munities and works, which have many kinds of interactions such as reading, posting, menting,and forwarding. 6. CONCLUSION Although social influence has impact on Emerce decision making, few studies have considered social influence in an Emerce decision support system, because until recently data about social interaction has not been adequately captured in Emerce. Currently, however, the Emerce customer base is at a turning point from a transactionbased society to are lationshipbased society. As Webbased social works have bee more popular, consumers who may not have plete information about a product or service often make use of previous customers’ opinions. It has bee apparent that the customer decision process is influenced by information from trusted people,not from product manufacturers or remendation systems. The social influence from high quality reviews written by previous consumers can have a direct, positive effect on potential consumers’ decision making, and this effect can propagate through a social work. Emerce panies are well positioned to take advantage of the social influence between consumers as a decision support tool by allowing a consumer to evaluate the appropriateness of remendations and reviews. Emerce panies can ultimately increase sales with less marketing cost. Thus, we believe that social influence bees a natural supplement that can be advantageously used by corporations in the Emerce decision making this paper, we present an overview of the impact of social influence in Emerce to point researchers and Emerce panies in the right direction. The main issues we should focus on are how to capture social interactions in Emerce w