A method for fabricating a nanoimprint mold core is disclosed. The method includes providing a substrate; forming on the substrate an amorphous thin film, which is transformed into a crystalline thin film upon receipt of energy, the crystalline thin film having physical and chemical characteristics different from those of the amorphous thin film; applying the energy onto a predetermined region of the amorphous thin film, to transform the amorphous thin film within the predetermined region into the crystalline thin film; etching the illuminated amorphous film, which has crystalline mark on amorphous film, and at least partially removing the area of remained amorphous thin films; performing an imprinting process on the substrate, which has the etched amorphous thin films formed; and performing a molding releasing process on the substrate, so as to obtain the nanoimprint mold core.
