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The ultrafast photoionization dynamics of N2 molecules by x-ray/XUV laser pulses is investigated.The molecu-lar frame photoelectron momentum distributions(MF-PMDs)and the molecular frame photoelectron angular distributions(MF-PADs)are obtained by numerically solving 2D time-dependent Schrodinger equations within the single-electron ap-proximation(SEA)frame.The results show that the molecular photoionization diffraction appears in 5 nm laser fields.However,when the laser wavelength is 30 nm,the molecular photoionization diffraction disappears and the MF-PMDs show four-lobe pattern.The ultrafast photoionization model can be employed to describe the MF-PMDs and MF-PADs of N2 molecules.