Based on the multi-configuration Dirac-Fock method,2 p photoionization process of sodium atoms from the initial state 2p~63p were investigated at a photon energy of 54 eV.Usually the relativistic effect has very obvious influence on atomic photoionization process.The influence of relativistic effects on the photoionization thresholds is negligible,but it can produce substantial change in the intensity distribution in photoelectron spectra,so that the spectra structures from the initial states 2p~63p(2 P1/2,...