Procedure and results of computations of stellar model atmospheres and spectral energy distributions are discussed .
Model atmospheres of some chemically peculiar stars are computed taking into account detailed information about their abundances :

— R CrB-like stars of Teff \sim 7000 K ,

— Sakurai ’ s object ( V4334 Sgr ) of 4000 < T _ { eff } < 7000 K

— Przybylski ’ s star of Teff \sim 6500 K .

We show that our self-consistent approach provides a unique possibility to investigate the temporal changes of physical parameters of chemically peculiar stars .

Some issues of computation of model atmospheres of M and C-giants are also considered .