  We study linearized graviton in the presence of a four-dimensional
cosmological constant in two brane models with a warped extra dimension. In
explicit models including bulk scalar fields, we calculate the masses of
Kaluza-Klein modes of graviton and their interactions with matter on the
visible brane. It is shown that the effects of the cosmological constant
contribute by the equivalent size to the warp factor, masses and couplings and
that bulk scalar fields can increase the effects. This is examined further
independently of the forms of scalar potentials. Then it is found how the
masses and couplings are described in terms of the warp factors and generic
scalar potentials. A possibility that the masses and couplings are
significantly changed by cosmological constant effects is discussed.
