Abstract: A holographic quintessence model in a nonflat universe was put forward to describe effectively the cosmological evolution of the holographic dark energy， in which a quintessence scalar field was reconstructed. The evolution equations of the holographic dark energy in a nonflat universe were derived， and furthermore the holographic quintessence model was reconstructed via the establishment of the correspondence with the canonical scalar field. Finally， the impacts of the spatial curvature on the model were discussed. The results showed that the main effect of the spatial curvature on the scalar field evolution was in the high redshift regions， and for the reconstructed potential of the scalar field， the smaller value of the field was， the more impact the spatial curvature existed.

Key words: holographic dark energy, scalar field model reconstruction, holographic quintessence, nonflat universe, cosmological evolution