the chemical potential dependence of the dilaton/gluodynamics potential, which can be determined by higher order baryon number fluctuations especially the kurtosis of baryon number fluctuations. From the experience in the PNJL model [@Li:2018ygx] as well as in the holographic QCD model [@Li:2017ple], the kurtosis of baryon number fluctuations is dominated by contribution from gluodynamics. Therefore, we fix the chemical potential dependence of the dilaton field by fitting the lattice results of the kurtosis of baryon number fluctuations [@Bazavov2017The] at zero chemical potential. It is found that the deconfinement phase transition in the $(T,\mu)$ plane is always a crossover, this is in agreement with the result in the PNJL model [@Li:2018ygx]. By adding the coupling of $\chi^6$ with chemical potential, the critical end point (CEP) shows up along the chiral phase transition line. It is also found that the chiral symmetry restoration and deconfinement phase transitions are separated. More interestedly, it is observed that there exists a region where chiral symmetry is restored but color degrees of freedom are still confined. This is similar to the quarkyonic phase obtained in the PNJL model [@Li:2018ygx]. The possible reason for the separation of the chiral and deconfinement phase transitions is due to the 