This article deals with the basic and with the most important ideas of the Swiss theologian Karl Barth. The author counts Barth as one of the most prominent 2001 century theologians. Grown up in a family of pastors and professors, he himself acquired a considerable theological education in the well known Swiss and German universities. His early Christian thinking supported liberal theology, but over time he changed his views so radically, that he established a new movement of Neo-orthodox and dialectic theology. Barth was a fertile author, recognized lecturer and publicly engaged Christian intellectual, and all of that forced him to flee from Germany in the Nazi period. In his scientific work he was interested in surveying all of the Christian traditions, including the early patristics which is the fimdament on which he “resurrected” triadology and eschatology. These were the fields mainly neglected in the protestant circles. He emphasized God’s transcendence and, in accordance with this, he also accented the importance of His concept of Revelation, and therefore his triadology was closely connected with God’s revelation to his people. In this context he stressed out the importance of Christ as a revealing Word of God. Ву this he pointed out the authority of the Holy Scripture as a human testimony of that revealed word. He also reaffirmed the importance of Chalcedon Christology and thus influenced many of the later German protestant theologians. Bart disapproved the Natural theology and religion and held it as a human attempt of acquiring knowledge about God. Triadology is in the basics of Barth’s anthropology and therefore he sees a human as Imago Dei, a being capable of relationship which involves love.