Abstract: The effects of pulse laser cleaning on the surface morphology and oxygen content of aluminum alloy at different cleaning speeds and pulse repetition frequencies were studied. The results show that with lower cleaning speeds（ 0. 1-0. 6 m/min）,the surface of aluminum alloy cleaned by pulse laser is in the state of sputtering and overlap. When the cleaning speed is greater than 0. 8 m/min,the crater formed by the pulsed laser becomes dispersed and independent; The content of oxygen element on the surface of aluminum alloy decreases first and then increases with the increase of the cleaning speed. When the cleaning speed is low or high,the content of oxygen element is close to the level of oxygen element on the surface of base metal. The distribution of oxygen element content has obvious regionality,and the oxygen content in the impact crater of pulsed laser is obviously higher than that in the surrounding non-impact location. With the increase of pulse repetition frequency,the surface morphology of aluminum alloy gradually changes from independent impact crater to sputtering overlap. The content of oxygen on the surface decreases significantly,which is about 1/2 of the oxygen content in the base metal,and the distribution of oxygen elements also gradually becomes diffuse.