Abstract: GH3536 alloy longitudinal and transverse samples were prepared by selective laser melting. After heat treatment and hot isostatic pressing treatment, some samples were machined into smooth-surface samples. The influence of surface state on tensile and fatigue properties was studied by comparing with build-surface samples. The results show that there was little difference in the longitudinal room temperature tensile properties between smooth-surface samples and build-surface samples, so the surface state had no significant effect on the tensile properties. Compared with that of smooth-surface samples, the strain fatigue life of build-surface samples was slightly lower, and the stress fatigue life of build-surface samples was significantly reduced, which was 2%-8% of smooth-surface samples. The cracks in the crack source region of the smooth-surface samples were radially shaped, those in the propagation region were vein-like, and there were a lot of dimples in the instantaneous fracture region. There were no obvious radial cracks in the build-surface samples, which was multi-source cracking, and the fracture was cleavage fracture.