  We present an analysis of cosmological models with mixed dark matter
(spectrum slope of density perturbations $n_S \in [0.6, 1.6]$, hot dark matter
abundance $\Omega_\nu \in [0.0, 0.6]$) in spatially flat Universe, based on
Press-Schechter formalism (P\&S). We found that the models with $n_S > 1$ and
$\Omega_\nu < 0.5$ are preferable. Additionally, for all considered models we
simulated $\Delta T/T\vert_{10^0}$ and compared it with the COBE measured
amplitude of CMB anisotropy. We found that the models favourable for galaxy
cluster abundance need large amount of cosmological gravitational waves (T/S $>
1$).
