The Einstein spontaneous emission coefficients of some rovibrational transitions of HBr molecule have been calculated from the first principle. The calculation is carried out for the deltav = 1 transitions of v < or = 7, J < or = 14 of R and P branches. A time-resolved Fourier transform infrared emission spectrum of the HBr molecule was recorded. The observed intensities of the spectral lines well agree the calculated coefficients.