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In this paper, we calculate the optical spectra data (crystal-field energy levels), the electron paramagnetic resonance (EPR) g factors g(parallel to), g(perpendicular to) of Yb3+ and hyperfine structure constants A(parallel to), A(perpendicular to) of Yb-171(3+) and Yb-173(3+) isotopes in CaWO4 crystal in a unified way from the crystal-field theory. All the calculated results are in good agreement with the experimental values. The signs of A(parallel to) and A(perpendicular to) for both isotopes Yb-171(3+) and Yb-173(3+) are suggested. (C) 2004 Elsevier B.V. All rights reserved.