Methodological analysis and unify principles foundations

The aim of the paper is a structural analysis of the methodological principle of unification and consideration of its application in the field of theoretical physics. The structure of this principle was explicated, and its onto-logical, epistemological and axiological foundations were demonstrated. It is shown that usage of unification principle in the framework of string theory reached a deeper conceptual level of unification, included not only the understanding of matter and its characteristics, but also concerning the concepts of space-time, and causality.