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A dynamical holographic QCD model has been developed by resembling the renormalizationgroup from ultraviolet (UV) to infrared (IR). The dynamical holographic QCD model is constructed 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. 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. The phase transition and jet quenching parameter have been investigated in the framework of dynamical holographic QCD model. It is found that both the trace anomaly and the ratio of the jet quenching parameter over cubic temperature show a peak around the critical temperature. The effect of jet
quenching parameter around phase transition on nuclear modification factor $R_{AA}$ and elliptic flow $v_2$ have also been analyzed. | 
