In this paper, using pulsed laser and continuous laser as the heat source of the selective laser melting process, the effects of different laser average powers and pulse duty cycles on the density, surface roughness, and microstructure of Ti6Al4V titanium alloy samples are studied. Experimental results show that compared with continuous laser, the use of pulsed laser with a duty cycle of 60%--70% can significantly improve the surface quality of the part. The surface roughness is as low as 3.6 μm, and the sample grain width is reduced from (1.14±0.23) μm to (0.85±0.18) μm, and can effectively eliminate the warpage caused by the accumulation of thermal stress during continuous laser processing.