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 } / 100 km / 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 } ( \leq 0.01 ) and h ( \sim 0.4 - 0.6 ) .
The best-fit parameters are as follows : N _ { \nu } = 3 , m _ { \nu } = 4.4 eV , h = 0.56 , \Omega _ { b } \leq 0.01 .
The high- \Omega _ { b } \sim 0.4 - 0.5 solutions are obtained when mass of neutrino is fixed and \leq 3 eV .

To explain the observable excessive power at k \approx 0.05 h / 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 ) .