The studies on L-edge XANES spectra of Mo, Ni and Cu species are reviewed. In case of Mo L3-edge XANES, a white line of the spectrum is assigned to the electron transition mainly from Mo 2 p to Mo 4 d. Therefore, the split of white line is interpreted to be the split of vacant d orbitals of hexavalent molybdenum ions. This simple interpretation of XANES spectrum allows to characterize the molybdate species on MgO, Al₂O₃, SiO₂ and TiO₂.On the other hand, the works on 3 d transition metals such as Ni and Cu are not abundant and the interpretation of the spectra is not simple. The reason is that the absorption phenomenon includes the interaction between core electrons and partially filled 3 d orbitals, which arises many kinds of transitions other than the simple 2p-3 d transition. However, the spectra of some Ni and Cu complexes are simulated by theoretical calculations. In case of Cu oxide complexes, d-holes are discussed relating to the superconductivity.