In this paper the induced uniaxial magnetic anisotropy of ferrites containing Co2+ and Ni2+ is discussed. For the former case, it starts from the mechanism proposed by Iida, taking into account the influence of cation vacancy upon the energy levels and wave functions of Co2+; while for the latter case, it is based upon the mechanism introduced by Schnettler-Gyorgy, considering the Jahn-Teller effect of Ni2+ in tetrahedral sites and deriving its energy levels and wave functions. Then the induced uniaxial magnetic anisotropy of both materials is calculated and may be comparable with the experimental results. The mechanism of the deviation of θu with θα is also discussed.