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The inner-shell 2p3/2 photoionization and the subsequent decay of Mg-like Fe14+,Cd36+,W62+ and U80+ ions are studied theoretically within the multiconfiguration Dirac Fock method and the density matrix theory.Special attention is paid to exploring the influence of the non-dipole terms which arise from the multipole expansion of the electron-photon interaction in the photoionization process.The results show that the non-dipole contribution to the total cross section,the magnetic sublevels cross section of the photoionization process,the degree of linear polarization and angular distribution of the subsequent characteristic x-ray radiation become more important with the increase of photons energy and atomic nuclear Z.Especially for the cross section and the degree of linear polarization,the non-dipole contribution arrives at 50％ for U80+ at four time energy threshold units.However,for the angular distribution,the maximum contribution does not exceed 4％,even for U80+ ions.