The generalization of the rheological model for multi-mode case. Were calculated according to the elastic modulus and the loss modulus, and a comparison with experimental data obtained for the highly branched LDPE. Obtained by comparison with experimental data the model parameters are then used to model the nonlinear effects in simple shear and uniaxial tension. The conclusion about the suitability of the considered rheological models to describe of stationary and non- stationary characteristics branched polymer melts.