  The opposite states of the $\tau$ polarization resulting from the charged
Higgs boson and the $W$ boson decays can be exploited to enhance the $H^\pm$
signal in the inclusive 1-prong hadronic decay channel of $\tau$. We suggest
practical methods of sharpening up the $H^\pm$ signature in the top quark decay
at LHC using this idea. As a result one can carry on the charged Higgs boson
search to within $\sim 20 GeV$ of the parent top quark mass over the full
parameter space of the MSSM.
