Abstract: The application of nitriding technology in the performance optimization of Ti-Al alloy is increasing, which is one of the most important development directions of this material. Nitrogen reinforced phase enhanced Ti48Al2Gr2Nb composites were prepared by direct nitride and discharge plasma sintering technology. The effect of NH₃, N₂ two gas direct titanium nitride powder was studied and the microhardness and wear resistance of corresponding nitride samples were tested,and the microhardness and wear resistance tests were conducted on the corresponding nitride samples. The synthetic products were characterized using scanning electron mirror（SEM）, X-ray diffraction phase analysis（XRD）, and X-ray energy spectroscopy analysis（EDS）. The results show that improving the increasing nitride temperature and insulation time are conducive to the generation of nitrogen strengthening phase. In this experiment, by comprehensively considering the powder nitride effect and the hardness and wear resistance of the test sample, it can be concluded that N2is more suitable for the nitride atmosphere of titanium aluminum alloy.