  We study the decay of charged scalar and spinor fields around
Reissner-Nordstrom black holes in de Sitter spacetime through calculations of
quasinormal frequencies of the fields. The influence of the parameters of the
black hole (charge, mass), of the decaying fields (charge, spin), and of the
spacetime (cosmological constant) on the decay is analyzed. The analytic
formula for calculation quasinormal frequencies for a large multipole number
(eikonal approximation) is derived both for the spinor and scalar fieldss.
