The laser heat treatment was used to replace the furnace heat treatment of the traditional retrogression re-aging（RRA）in the regression stage in order to achieve a better effect of short-time high temperature regression treatment.The heat treatment process was presented as follows:the heating temperature of the pre-aging stage at 120 ℃for 16 hwith laser heat treatment in the regression stage

where the laser power is 650 Wand the scanning speed is 2 mm/s with the re-aging stage at 120 ℃for24 h.The high temperature tensile tests of the alloy with heat treatment were carried out.The results show that with the increase of temperature

the strength loss of the alloy at high temperatures is severe

while the elongation is increased greatly

and the fracture can form obvious necking.The high temperature properties of the alloy after LRRA heat treatment are superior to those of ones after RRA heat treatment.The advantage of LRRA heat treatment becomes more obvious with the increase of temperature.