  Formulas for the longitudinal dielectric permeability in quantum degenerate
collisional plasma with the frequency of collisions proportional to the module
of the wave vector, in Mermin's approach, are received. Equation of
Shr\"{o}dinger - Boltzmann with integral of collisions relaxation type in
Mermin's approach is applied. It is spent numerical and graphic comparison of
the real and imaginary parts of dielectric function of non-degenerate and
maxwellian collisional quantum plasma with a constant and a variable
frequencies of collisions. It is shown, that the longitudinal dielectric
function weakly depends on a wave vector.
