  We construct an improved soft-wall AdS/QCD model with a cubic coupling term
of the dilaton and the bulk scalar field. The background fields in this model
are solved from the Einstein-dilaton system with a nontrivial dilaton
potential, which has been shown to be able to reproduce the equation of state
from lattice QCD with two flavors. The chiral transition behaviors are
investigated in the improved soft-wall AdS/QCD model with the solved
gravitational background, and the crossover transition can be realized. Our
study provides a possibility to address the deconfining and chiral phase
transitions simultaneously in the bottom-up holographic framework.
