By a linguistic study of the words "Imam" and "good example", we find the words intention, attention, leadership, guide, index, criterion,... .In a Theological definition, "Imamat" means "general governance and sovereignty in both religious and worldly affairs over the liable persons, as the divine appointed successor of the holy Prophet".In the Shia traditions and culture, the holy Imam is divinely granted all the virtues and characters of the holy Prophet, such as "infallibility", "Divine Appointment", "Divine knowledge", ... except the position as messenger or Prophet. The human beings due to different reasons, and requirements of ther natures would like to follow desirable patterns and examples. in this holy Qur’an, to follow the good example in affirmed as a behavorial educational method. In a Qur’anic Lsearch of the title "good example" we find out that the holy Prophet has been a "good example" for the Islamic communities in various guiding affairs.In this article the necessity of observing the holy infallible Imams and the guides and good example for the wh ole mankind, and the Islamic communities, in particular, is discussed. At the same thime some of the virtues and qualites of the holy Imams, as acknowledged in the Islamic traditions and prays are presented.