N and Al co-doped TiO2 nanomaterial (N-Al-TiO2) and Al-doped TiO2 material are synthesized through a solid-state reaction route. The textural properties of the samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet visible light spectroscopy (UV-Vis) and X-ray photoelectron spectroscopy (XPS). The photo- degradation properties of puerarin on the materials from irradiating with visible light are investigated. It clearly shows that the microscopic structure of N-Al-TiO2 nanomaterial with crystal anatase phase is a short-rod shape. N atoms as N3- states have been incorporated into the lattice of TiO2 or have been entered into the interstice of TiO2 lattice. Al ions occupy the sites of Ti in crystal lattice by isomorphous replacement. The percent content (%) of atoms such as N, Al, Ti and O in N-Al-TiO2 nanomaterial is 7.8, 3.6, 32.7 and 55.9, respectively. Moreover, the UV-Vis absorption intensity of N-Al-TiO2 nanomaterial is higher rather than that of pure TiO2 and Al-TiO2 materials. Enjoyably, The visible light degradation activity for puerarin is presented as follows as N-Al-TiO2＞TiO2＞Al-TiO2.