  Resembling the renormalization group from ultraviolet to infrared, we
construct a dynamical holographic model in the graviton-dilaton-scalar
framework, where the dilaton background field $\Phi$ and scalar field $X$ are
responsible for the gluodynamics and chiral dynamics, respectively. At the UV
boundary, the dilaton field is dual to the dimension-4 gluon operator, and the
scalar field is dual to the dimension-3 quark-antiquark operator. The metric
structure at IR is automatically deformed by the nonperturbative gluon
condensation and chiral condensation in the vacuum. The produced scalar
glueball spectra in the graviton-dilaton framework agree well with lattice
data, and the light-flavor meson spectra generated in the
graviton-dilaton-scalar framework are in well agreement with experimental data.
Both the chiral symmetry breaking and linear confinement are realized in this
dynamical holographic QCD model. The necessary condition for the existence of
linear quark potential is discussed, and the pion form factor is also
investigated in the dynamical holographic QCD model.
