  In this work, we offer a dynamical soft-wall model to describe the
gluodynamics and chiral dynamics in one systematical framework. We firstly
construct a quenched dynamical holographic QCD (hQCD) model in the
graviton-dilaton framework for the pure gluon system, then develop a dynamical
hQCD model for the two flavor system in the graviton-dilaton-scalar framework
by adding light flavors on the gluodynamical background. For two forms of
dilaton background field $\Phi=\mu_G^2z^2$ and
$\Phi=\mu_G^2z^2\tanh(\mu_{G^2}^4z^2/\mu_G^2)$, the quadratic correction to
dilaton background field at infrared encodes important non-perturbative
gluodynamics and naturally induces a deformed warp factor of the metric. By
self-consistently solving the deformed metric induced by the dilaton background
field, we find that the scalar glueball spectra in the quenched dynamical model
is in very well agreement with lattice data. For two flavor system in the
graviton-dilaton-scalar framework, the deformed metric is self-consistently
solved by considering both the chiral condensate and nonperturbative
gluodynamics in the vacuum, which are responsible for the chiral symmetry
breaking and linear confinement, respectively. It is found that the mixing
between the chiral condensate and gluon condensate is important to produce the
correct light flavor meson spectra. The pion form factor and the vector
couplings are also investigated in the dynamical hQCD model. Besides, we give
the criteria for the existence of linear quark potential from the metric
structure, and show a negative quadratic dilaton background field is not
favored in the graviton-dilaton framework.
