The pressure broadening in the far wings, where the sodium Na (3p←3s) resonance line is perturbed by ground lithium Li (2s) atoms, has been theoretically analyzed. The NaLi potential–energy curves and the transition dipole moments are constructed by using a reliable ab initio data points to carry out the reduced-absorption coefficients kr (ν, T ). This quantum-mechanical investigation have demonstrated that the NaLi profile spectra show a satellite future in the red wing at wavelengthλ =685 nm in the temperature range 4000 K–1.8 × 104 K. The computation could also exhibit a second satellite, in the blue wing, near the wavelengthλ=574 nm beyond 6000 K and a third peak located atλ=490 nm which begins to appear at 1.8 × 104 K.