By literature study, this thesis reviewed the existing theories and study about Web2.0 and Web2.0 websites, built the model of impact on the web2.0 websites users' attitude and behavioral intention. By the pre-test and the pathfinding test, carried out the reliability analyze, the validity analyze and the exploring factor analyze, handed out the large sample questionnaires to collect the information of the Web2.0 users. After that, using the large sample information to do the confirmatory literature analyze, verified the relationship among the factors---opening, reusability, personalization, sharing, socialization and unity, the users' attitude, and users' behavior intention. Made suggestion according to the model analysis results, so as to pro vide reference and help to the websites service providers.