Using TC4 titanium alloy powder as raw material, selective laser melting (SLM) forming experiments and numerical simulation were conducted to investigate the influence of process parameters on the properties of the forming parts with equal laser energy density. The results show that the laser power and scanning speed have significant effects on the molten pool size at the constant laser energy density. The powder layer thickness is the most important factor affecting the surface roughness of the sample, and the optimal powder layer thickness is 0.03 mm. Although the laser energy density is the same, the surface morphology and microstructure of the sample are still affected by the combination of different process parameters. No significant effect is found on the surface hardness of SLM deposition under different process parameter combinations at equal laser energy density.