<p>In this paper, the laser selective melting technology was used to prepare GH3536 alloy, and systematically studied the influence of SLM process parameters on dimensional accuracy, upper surface roughness, side surface roughness, and density. The four optimal combinations of process parameters obtained can provide a theoretical basis for the SLM process of GH3536 alloy. The results indicate that the size of printed parts increases with higher laser power and decreases with increasing scanning speed and spot compensation. The roughness of the upper surface initially decreases and then increases with increasing scanning distance, whereas the roughness of the side surface decreases with an increasing number of contour scanning passes. Both upper and side surface roughness values decrease with increasing laser power and energy density but increase with increasing scanning speed. The density first increases and then decreases as scanning distance, laser power, scanning speed, and energy density vary. Finally, utilizing the optimal densification parameters—laser power of 160 W, scanning speed of 800 mm/s, and scanning distance of 0.07 mm—the printed GH3536 alloy exhibits superior mechanical properties compared to the traditional hot rolling process, with a yield strength increased of 69.8 %.</p>