  We consider the peculiarities of the optical spectra of far evolved stars
with circumstellar gaseous-dusty envelopes: the time variability of the
absorption-emission profiles of the H$\alpha$ line, the presence of stationary
emission and absorption molecular bands, multicomponent complex profiles of the
NaI D-doublet lines. We show that the peculiarities of the line profiles (the
presence of an emission component in the NaI D-doublet lines, the specific type
of the molecular features, the asymmetry or splitting of the profiles of
strongest absorptions with low excitation potential of the low level) can be
associated with the kinematic and chemical properties of the circumstellar
envelope and its morphological type.
