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In this paper, the nickel site, optical spectra and electron paramagnetic resonance (EPR) g factor of nickel-zinc phosphate glasses have been studied by ligand-field theory. The orbital mixing effect between p and d orbits has been included in the calculation by two-spin-orbit parameter model. The present study shows that nickel occupies the tetrahedral zinc site with cubic symmetry in nickel-zinc phosphate glasses. Unlike the result of previous study that assigns nickel to an octahedral interstitial site, it is an optional explanation for nickel sites in nickel-zinc phosphate glasses by analysing the optical absorption spectra and EPR g factor. (C) 2011 Elsevier B.V. All rights reserved.