The high cycle fatigue performance and fracture mechanism of 2A70 aluminum alloy after laser and vibration marking were studied.The results showed that compared with the base material, the high cycle fatigue life of 2A70 alloy after vibration marking decreased by 57% and that of laser marking decreased by 94%, which was only 14% of the fatigue life of vibration marking.Compared with laser marking, the topography near vibration marking is more gentle, the stress concentration degree is smaller, the S "phase size is smaller and the volume fraction is higher.Al₉FeNi phase has smaller size, higher volume fraction, lower crack initiation and propagation rate, and longer fatigue life.The high cycle fatigue performance of 2A70 aluminum alloy under vibration marking is much better than that under laser marking due to the joint action of stress concentration, precipitation phase size and volume fraction.S