In order to enhance the surface finish of Laser Direct Deposition of metallic components, a method that applies femtosecond laser to fabricate the cladding layer was proposed in this paper. The effects of the energy density, distribution, and the overlapping ratio of the laser on the sidewall quality of the cladding layer were studied in experiment. The experiment results show that the roughness of the achieved cladding side-wall layer can be smaller than 3 μm once the energy density in the region is 0.12-0.34 J/cm² for the Gaussian-shape laser or 0.13-0.66 J/cm² for the rectangle-shape laser. And the cladding sidewall layer fabricated by Gaussian-shape laser possessed more excellent surface quality than the product fabricated by rectangle-shape laser with same parameters. The roughness of the cladding sidewall layer decreases and then increases with the increase of the laser overlapping ratio, and the optimal region of overlapping-ratio is 78%-85%.