The paper classifies the model of b2b websites to procurement distribution intermediary website by the role the b2b ' s owner has taken and analyses the origin characteristics and some principles for website operations respectively . three kinds of b2b websites are discussed according to six criteria which include visibility frequency service focus interface cost & integration and ability to make profit 目前b2b网站的模式繁多，本文根据b2b网站所依附的实体在交易过程中所处的角色将b2b网站分为三大类，即采购型网站、分销型网站和中介型网站，并对这三种网站的产生，所具有的特点及实施的原则等方面进行具体的分析。
