The basic purpose of this work was to develop correct disorder measure for phase transition of stochastic system. It was shown that control parameter of system evolution can be defined as relation between power, injected into system and power, dissipated in nonlinear mechanisms. It was suggested to define benchmark of system disorder, zero state entropy, through implicit condition of zero dynamic entropy. In terms of suggested control parameter Prigozhin nonlinear theorem was deduced on base of Klimontovich self – organization theorem. Phase space area, described by universal Prigozhin theorem, was defined as typical chaotic model - strange attractor.