  We investigate the possibility to discover the charged Higgs via $pp\to
W^{\pm}H^{\mp}\to l+\met+b\bar{b}jj$ process at LHC, which suffers from large
QCD backgrounds. We optimize the kinematic cuts to suppress the backgrounds, so
that the reconstruction of the charged Higgs through hadronic decay is
possible. The angular distribution of the b-jet from $H^{\pm}$ decay is
investigated as a way to identify the charged scalar from vector bosons.
