The deposited state and microstructure characteristics of GH3536 alloy formed by selective laser melting were investigated, and the effects of different cooling methods on microstructure and high temperature tensile properties were compared. Through continuous optimization of GH3536 printing parameters, it can be seen that high laser power will cause serious sputtering problems, and low laser power will produce pores. It is confirmed that the optimal power range is 50~70 J/mm3. The optimal printing parameters are: laser power is 170 W, scanning rate is 1 060 mm/s, scanning spacing is 0.08 mm, layer thickness is 30 μm, the scanning angle between layers is 67°, and the density of the alloy can reach 99.97%. After holding at 1 175 ℃ for 30 minutes, recrystallization occurs in the alloy after three cooling modes: water cooling, air cooling, and furnace cooling. Under the condition of furnace cooling, a certain amount of carbide precipitates at the grain boundary; Under the condition of water cooling, annealing twins are formed in the crystal. Through the high temperature tensile test at 855 ℃, the fracture tensile rates are obtained under the three cooling methods are more than 25%. Under the condition of furnace cooling, because the carbide precipitated at the grain boundary strengthens the grain boundary and improves the high-temperature plasticity of GH3536, the tensile rate is the best, up to 29%. The heat treatment system effectively improves the poor high-temperature plasticity of deposited GH3536, and provides a reliable scheme for the application of aerospace combustor parts.