  Interaction of Higgs scalar (H) with weak gauge bosons (V=W,Z) is the {\it
key} to understand electroweak symmetry breaking (EWSB) mechanism. New physics
effects in the HVV interactions, as predicted by models of compositeness,
supersymmetry and extra dimensions, can be formulated as anomalous couplings
via a generic effective Lagrangian. We first show that the existing electroweak
precision data already impose nontrivial indirect constraints on the anomalous
HVV couplings. Then, we systematically study VV --> VV scatterings in the TeV
region, via Gold-plated pure leptonic decay modes of the weak bosons. We
demonstrate that, even for a light Higgs boson in the mass range 115GeV < m_H <
300GeV, this process can directly probe the anomalous HVV interactions at the
LHC with an integrated luminosity of 300fb^{-1}, which further supports the
``No-Lose'' theorem for the LHC to uncover the EWSB mechanism. Comparisons with
the constraints from measuring the cross section of VH associate production and
the Higgs boson decay width are also given.
