Abstract
The aim of this article is to show the Christological - Sacramental bases of the «mysticism» of Eucharist in encyclical Deus caritas est by Benedict XVI. Three connected with oneself questions were undertaken within our considerations closely. The analyses of the foundation of Eucharistic «mysticism» were executed of in first place what there is the secret of God’s Son incarnation. Reports setting between Last Supper, death and Resurrection the Christ and Eucharist were considered then. The essence of the eucharistic «mysticism» which consists in the man timehononoured unification with God and the influence of Eucharist on being shaping the Communion Ecclesiological was introduced on the last stage.