By using a fully relativistic distortedwave method, the electron impact excitation cross sections of Belike N3+ and O4+ ions from the ground state 2s21S to 2s2p 1,3P, 2p23P, 1D and 1S 2s2p and from the metastable 2s2p 3P to 2p23P have been calculated systematically. Meanwhile, the correlation effects of target states are also discussed. For the low energy collisions the correlation effects play a very important role, and accurate target wavefunctions are needed, but for the high energy collisions, the more correlation effects are not so important. For twoelectron excitations, the configuration interactions are very important and the excitations from ground state to the 2p23P0 and 1S0 have larger cross sections than the other tow electron excitations.