ZrO2 porous nanosolid has been successfully prepared by a novel hydrothermal hot-press (HHP) method, using ZrO2 nanoparticles as the starting material. Furthermore, a kind of O, O-donating chelating regent, morin was assembled into the pores of ZrO2 porous nanosolids, and a morin/ZrO2 porous nanocomposite was obtained. Because of the interaction between morin molecules and the surface of ZrO2 porous nanosolid, a blue-shift of the photoluminescence (PL) peak was observed in ZrO2/morin nanocomposite by comparing with that of morin.