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Electronic structures of the Mn2+:CdMoO4 crystal are studied within the framework of the fully relativistic self-consistent Dirac-Slater theory,using a numerically discrete variation (DV-Xα)method.The calculated results indicate that the 3d states of Mn have donor energy level in the forbidden band of CdMoO4 crystal.The transition energy of O 2p→Mn 3d is 3.12 eV under excitation corresponding electronic transition being O2-+Mn2+ hvex=3.12 eV→ O-+Mn+hvem→O2+Mn2+.