  The possibility of determining MDM model parameters on the basis of
observable data on the Abell-ACO power spectrum and mass function is analysed.
It is shown that spectrum area corresponding to these data is sensitive enough
to such MDM model parameters as neutrino mass $m_{\nu}$, number species of
massive neutrino $N_{\nu}$, baryon content $\Omega_b$ and Hubble constant
$h\equiv H_0/100km/s/Mpc$. The $\chi^2$ minimization method was used for their
determination. If all these parameters are under searching then observable data
on the Abell-ACO power spectrum and mass function prefer models which have
parameters in the range $\Omega_{\nu}$ ($\sim 0.4-0.5$), low $\Omega_b$ ($\le
0.01$) and $h$ ($\sim 0.4-0.6$). The best-fit parameters are as follows:
$N_{\nu}=3$, $m_{\nu}=4.4eV$, $h=0.56$, $\Omega_b\le 0.01$. The
high-$\Omega_b\sim 0.4-0.5$ solutions are obtained when mass of neutrino is
fixed and $\le 3eV$.
  To explain the observable excessive power at $k\approx 0.05h/Mpc$ the peak of
Gaussian form was introduced in primordial power spectrum. Its parameters
(amplitude, position and width) were determined along with the MDM model
parameters. It decreases $\chi^2$, increases the bulk motions, but does not
change essentially the best-fit MDM parameters.
  It is shown also that models with the median $\Omega_{\nu}\sim 0.2-0.3$
($m_{\nu}\sim 2.5$, $N_{\nu}\sim 2-3$) and $\Omega_b=0.024/h^2$, which match
constraints arising from cosmological nucleosynthesis and high redshift
objects, are not ruled out by these data ($\Delta \chi^2<1$).
