The excitation energies and fine structure splittings of 1s2nd (n≤9) states for Ni25+ ion are calculated in this paper. Non-relativistic energies are obtained with the eigenvalue of non-relativistic Hamiltonian operators; the relativis-tic and mass-polarization effects on the energies are included as the first-order perturbation. The fine structure splittings are determined from the expectation value of spin-orbit and spin-other orbit interaction operators. In order to make the results more precise, quantum-electrodynamics (QED) contribution and higher-order relativistic contribution are con-sidered for highly charged Ni25+ ion. The results of fine structure splittings agree with the experimental data excellently, and the error is no more than several cm？1. Compared the excitation energy calculated with experimental data, the rela-tive error is only 0.2‰ - 0.6‰. It indicates the results obtained in this paper are both reliable and accurate.