Ni-20Cr-4Mo-0.15C and Ni-20Cr-4Mo-0.15C-12.85TiC-3TiN (wt%) alloys were prepared by powder metallurgy method, in order to investigate the effect of Ti(C,N) on microstructure, mechanical properties and oxidation resistance at 800 °C of Ni-based superalloys. Results show that due to the addition of 12.85wt% TiC and 3wt% TiN, the formed Ti(C,N) particles dispersed within grains and at grain boundaries of austenite matrix, therefore austenite grains became fine. The density of supralloys decreased from 8.38 to 7.5 g/cm3, the hardness increased from 1850 to 3430 MPa, and the tensile strength increased from 752 to 1192 MPa. In addition, the superalloys still exhibited good oxidation resistance in air at 800 °C, and the oxide scale formed mainly consisted of α-Cr2O3 and TiO2