Graphite parts prepared by selective laser sintering technology have poor porosity, bending strength and poor electrical conductivity, and are difficult to directly use as functional structural parts. In this paper, the effects of two post-treatment processes on the overall performance of SLS graphite parts are compared. Studies have shown that the vacuum pressure impregnation of phenolic resin solution has limited performance improvement on SLS graphite parts. After three vacuum pressure impregnation, carbonization and high temperature sintering, the sample density can reach 1.24 g/cm3, correspondingly the flexural strength and conductivity reached 27.11 MPa and 253.80 S/cm, further difficulty is more difficult; and the hot pressing curing process is relatively easy to densify. Under the pressure of 3.00 MPa, the sample density can reach 1.59 g/cm3, after carbonization and high temperature sintering. Its flexural strength and electrical conductivity reach 33.88 MPa and 380.98 S/cm. Finally, the feasibility of the above process was verified by post-processing the porous graphite skeleton and graphite mold.