  We study a possibility of observation of the first Kaluza-Klein (KK)
excitation of gluon in a warped extra dimension model at the LHC. In our
analysis, we adopt the KK gluon mass and the b-quark coupling to the KK gluon
as model parameters and study the sensitivity of the ATLAS experiment to
observe the KK gluon through the two $b$-jets channel.
