  In this work, we consider the smoothing effect of Vlasov-Poisson-Landau
system for both hard and soft potential. In particular, we prove that any
classical solutions becomes immediately smooth with respect to all variables.
We also give a proof on the global existence to Vlasov-Poisson-Landau system
with optimal large time decay. These results give the regularity to
Vlasov-Poisson-Landau system. The proof is based on the time-weighted energy
method building upon the pseudo-differential calculus.
