In this paper, a TC4 component produced by laser selective melting was used as the research objects and the influence of inclination angle on the forming accuracy of their internal structure was explored. A TC4 component with different inclined channel structures was designed and printed under optimized parameters. The internal structure of the sample was observed using industrial computed tomography equipment. Then, it was imported to PolyWorks software for fitting and comparison to detect the deviation degree and surface quality of the internal structure of the sample. The results demonstrate that the inclination angle greatly influences the overhang degree and surface quality of the internal structure of the TC4 component. When the inclination angle increases gradually to 50°, the deviation degree of the suspended surface of the internal structure is reduced and the printing quality is considerably improved. Additionally, as the inclination angle continues to increase, the deviation degree increases and the printing quality is notably reduced.