In this work, GH3536 alloy specimens were fabricated by selective laser melting (SLM). The microstructure, high temperature tensile properties and fatigue crack growth rate of the specimens were investigated after hot isostatic pressing and solution treatment. The results show that there are two kinds of equiaxed grains of different sizes in the alloy samples after hot isostatic pressing and solution treatment, and there are continuous lamellar distribution of M23C6 and M6C carbides between the grains. The tensile properties of the alloy specimens decreased continuously with the increase of temperature, and the fracture mode changed from ductile fracture at room temperature to brittle fracture at 900℃. Under different stress ratios, the crack propagation mode of the specimens is transgranular propagation. The increase of stress ratio will accelerate the crack growth rate, which is caused by the inclination of fatigue crack propagating through these grains with low grain boundary misorientation.