This work aims at examining the concept of the remnant in Old Testament Prophets with particular attention to prophet Isaiah.  In it, efforts are made to trace the history of remnant and the importance of the idea to the religion of Israel.  It is discovered that it was in the mind of God to work through few people to carry out his purpose for the world. The work considers the election and the consequent covenant which God made with Israel as basic background for the idea of remnant in the Old Testament Prophets.  It is discovered that the remnant later retains the election of Israel.  For remnant emerges when there seemed to be no hope for the survival of the nation Israel.