The transition energies between n = 3 and n = 2 of the Ne-like ion Ge22+, Se24+, Zr30+, Rh35+, Ag37+, Sb41+, Xe44+, La47+, Nd50+ and Eu53+ are calculated by adding polarization in the core. The systematic errors in multiconfiguration Dirac-Fock calculation are greatly reduced and a good agreement is obtained between the theory and the experiment. This study shows that introducing the polarization of core orbitals is a good method to calculate the atomic structure, and there is a close relation between polarizability and nucleus charge.