  The production of charged Higgs boson pairs from gluon-gluon fusion is
studied in the minimal supersymmetric model(MSSM) at proton-proton colliders.
We find that the contribution of the scalar quark loops to the subprocess
production rate is substantial and consequently the production rate in
proton-proton colliders is enhanced in the MSSM if there exist scalar quarks
with favorable masses. The results show that this cross section may reach a few
femptobarn in the future LHC collider with plausible values of the parameters.
