The total internal partition sums (TIPS) were calculated for nitrous oxide with the product approximation. For rotational partition sums Qrot, the centrifugal distortion corrections are under consideration. The calculation method for the vibrational partition sums Qvib used is the harmonic oscillator approximation. Using experimental transition moment squared and Herman-Waills factor coefficients and the calculated partition functions, we computed the line intensities of 3000—0200 and 1001—0110 transitions of nitrous oxide at several temperatures. The agreement between the calculated line intensities and experimental results and those extrapolated from HITRAN database is fairly good at temperatures up to 3000 K, which shows that the calculation of partition function and line intensity at high temperature is reliable. Furthermore, the line intensities and spectral simulations at the higher temperatures of 4000 and 5000 K are also presented.