The most distinctive feature of Imamiyya is its understanding of imamate. Imamiyye that regards the imamate as one of the main fundamentals of religion held that it determined by God and thus ascribed the imams many supernatural features. This also arose many questions. One of them, perhaps the most important one, is about the similarities and difference between the prophethood and imamate, since the attributes ascribed to the imams caused the positions of prophets and imams to be mixed. In this article, the understanding of prophethood and imamate, and the differences and similarities between will be focused on. The article has been restricted to infallibility, source of knowledge, superiority, mission and authority