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In tetragonal ligand-field,the energy levels and third-order perturbation formulas of EPR (zero-field splitting D and g-factors) for 3d3/7 configuration ions have been constructed based on Zhao’s Semi-SCF d-orbit wave functions model,Macfarlane’s perturbation loop method and point-charge crystal field model.In these formulas,the contributions from configuration interaction,covalency effect,Racah-Trees corrections and local structure distortion have been considered.