This paper examines the factors affecting the intention of consumers to purchase online group buying the most important factors of various studies have been identified. Many studies have explored main factors affecting willingness to purchase online group buying, but each of which has focused on a few factors of a particular point of view. In this project, we present a framework includes all the factors studied from the literature review, then are categorized and selected main factors basis of experts advices. Moreover, we have envestigated on Iranian online group buying websites too. It was basis of questainaire and direct observation of websites. This shows some challenges and problemas to expand their business models which have been presented in the final session of the project.