Consider one of the basic conditions for the formation of two-system of the rock stress state during its genesis on an example of formation of sedimentary clastics, which is that its components (skeleton and filler) simultaneously operate the two systems of internal stresses. The interaction of these systems starts when the external load under which formed such an environment. In the reduction of external load under strain compatibility rock elements belonging to different systems, formed transdvuhsistemnoe field of internal stresses of opposite signs (compressive and tensile).