利用高功率、短脉冲NdYAG激光对6061-T651铝合金进行表面冲击强化处理，并分别在200 ℃、300 ℃、400 ℃和500 ℃的温度下对其进行性能测试，从残余应力、显微硬度和微观组织等方面分析了激光冲击处理(LSP)对其在高温条件下性能的影响。研究结果表明中高温条件下激光冲击6061-T651铝合金的强化效果明显。200 ℃和400 ℃时试件的最大残余压应力出现在次表层，且温度越高残余压应力释放得越快，激光冲击硬化层深度约为0.3 mm，500 ℃时的晶粒平均尺寸要比400 ℃时的大，晶粒尺寸和强化相是提高硬度的主要原因，不连续且粗大的晶界析出物提高了6061-T651铝合金的抗腐蚀性能。

The 6061-T651 aluminum alloy samples are treated by laser shock processing (LSP) with high power and short pulse NdYAG laser, and then are kept warm at 200 ℃, 300 ℃, 400 ℃ and 500 ℃ respectively. The effects of 6061-T651 aluminum alloy on mechanical properties after LSP are analyzed from residual stress, micro-hardness and microstructure during elevated temperature. The results indicate that the strengthening effect of 6061-T651 aluminum alloy by LSP at elevated temperature is obvious. The maximum residual stress of specimens are tested in subsurface at 200 ℃ and 400 ℃. At the same time, the higher the temperature, the faster the residual stress releases. The hardening layer depth of 6061-T651 aluminum alloy is about 0.3 mm. The primary cause of improving micro-hardness is grain size and strengthening phase, and the pitting resistance of 6061-T651 aluminum alloy is improved obviously by the big and discontinuous precipitated phase.