00-06E

An analytical method of the consistent calculation of the thermodynamical and correlation functions of pseudospin-electron model is proposed. Approach is based on the generalized random phase approximation scheme with the self-consistent inclusion of mean field type contributions coming from the effective pseudospin interaction via conducting electrons as well as gaussian fluctuations of the mean field. With the help of the approximation proposed the formulas for the pseudospin correlation function, pseudospin mean value, as well as for the grand canonical potential are obtained.