[en] The modified model of the ''snow plough'' for the analysis of plasma dynamics in the fast compression phase with account for field diffusion and entropy variation of the plasma is described. The calculations carried out using the MHD-model taking into account the processes of classical and anomalous transport have shown that the constructed modified ''snow plough'' model satisfactorily describes the behaviour of main parameters characterizing theta-pinch dynamics. On the basis of the last model it is obtained that the increase of plasma turbulence power sharply decreases radial compression, however the total energy remains almost constant. Approximate analytical solutions are obtained which are in satisfactory agreement with the numerical calculation results and permit to forecast the evolution of temperature, magnetic field and radius of the plasma filament. The efficiency of time decrease of magnetic field growing for increase of energy contribution into plasma has been shown