We study cosmological application of interacting holographic dark energy density in the scalar Gauss-Bonnet framework. We employ the interacting holographic model of dark energy to obtain the equation of state for the interacting holographic energy density in a spatially fiat universe. Our calculations show that taking ΩA = 0.73 for the present time, it is possible to have weffA crossing -1. This implies that one can generate a phantom-like equation of state from the interacting holographic dark energy model in fiat universe in the scalar Gauss-Bonnet cosmology framework. Then we reconstruct the potential of the scalar field.