By employing the method of ligand field theory, we calculated the additional potential energies of d electron states of V3X(X = Si, Ga, Ge, Sb, Sn) superconducting compounds, these energies are induced by the D2d) crystal field. We obtained the analytic relation between the. lattice constant and the relative displacement of d sublevels △E⊥, which is the characteristic quantity for the model of d band relative displacement. The numerical values of △E⊥ and the magnetic susceptibilities calculated by using them are also presented.

According to the model of the relative displacement of the d subbands in reference [1], the paramagnetic susceptibility and its temperature dependence of V3B type of A-15 superconducting compounds are calculated. The results are roughly in agreement with experimental data.