  Phenomenology of a radion ($\phi$) in the Randall-Sundrum scenario is
discussed. The radion couples to the trace of energy momentum tensor of the
standard model with a strength suppressed only by a new scale
($\Lambda_{\phi}$) which is an order of the electroweak scale. In particular,
the effective coupling of a radion to two gluons is enhanced due to the trace
anomaly of QCD. Therefore, its production cross section at hadron colliders
could be enhanced, and the dominant decay mode of a relatively light radion is
$\phi \to g g$, unlike the SM Higgs boson case. We also present constraints on
the mass $m_{\phi}$ and the new scale $\Lambda_{\phi}$ from the Higgs search
limit at LEP, perturbative unitarity bound and the stability of the
radion/Higgs potential under radiative corrections.
