The optical and electron paramagnetic resonance(EPR)parameters of ZnS:V³⁺ crystal are correlated with the local structure of the ionic cluster. According to Sugano-Tanabe's scheme,complete energy matrix(45×45)of d^2/8 electron system is constructed. EPR parameter formulae are deduced from spin Hamiltonian theory. Meanwhile,the relationship between crystal parameter and the local structure of ionic cluster in T_d symmetry is obtained via point-dipolar model. Based on the semi-self-consitent-field(semi-SCF)d-orbital model and the complete energy matrix diagonalization procedure(CDP),the optical spectra and g factor of ZnS:V³⁺ are uniformly explained from the local structure. The calculated results agree well with the experimental findings. Calculated results show that,the optical and EPR spectra of ZnS:V³⁺ can be well understood in the framework of crystal field theory.