  To find what influence the charge of the black hole $Q$ will bring to the
evolution of the quasinormal modes, we calculate the quasinormal frequencies of
the neutrino field (charge $e=0$) perturbations and those of the massless Dirac
field ($e\neq 0$) perturbations in the RN metric. The influences of $Q$, $e$,
the momentum quantum number $l$, and the mode number $n$ are discussed. Among
the conclusions, the most important one is that, at the stage of quasinormal
ringing, the larger when the black hole and the field have the same kind of
charge ($eQ>0$), the quasinormal modes of the massless charged Dirac field
decay faster than those of the neutral ones, and when $eQ<0$, the massless
charged Dirac field decays slower.
