Extensive researches have been conducted so far on titanium aluminide alloys for aerospace and medical applications. Titanium aluminides have special properties such as high specific strength and good creep resiatance. Nevertheless, their ductility and fracture toughness are low and need improvements. In this research, nitrogen element with 0.5, 1 and 2 atomic percents was added to the second-generation titanium aluminides alloy Ti-48Al-2Cr-2Nb (4822). Following preparation of the as-cast samples using vacuum arc remelting method, hot isostatic pressing, solution annealing and two aging treatments were done. High temperature small punch test was used to investigate mechanical properties of the as-anealed and as-ages samples. The results showed that with increasing nitrogen content, the microstructure was highly refined due to inoculeation effect of the in-situ nitride precipitates. The hot isostatic pressing was efficient in decreasing the pore content of the samples; however, increasing the nitrogen content was resulted in an increase in pore content. After the solution annealing treatment, the maximum force of the small punch test in the nitrogen-containing alloys became lower than the 4822 alloy. Interestingly, after aging treatments despite the sharp reduction in the maximum force of the small punch test of the 4822 alloy, the warm strength of the nitrogen-containing alloys was well maintained. The nitrogen-containing alloys exhibited relatively high sensitivity to the aging treatment. The aging treatment of the nitrogen-containing alloys in the lower temperature and higher time showed better results. The stability