The F-C factors, spontaneous radiation coefficients and fluorescence spectra corresponding to the 23∏g-as∑u+ transition in Li2 were calculated by the calculated RKR potential curves of the 23∏g and a3∑u+ states and soluting of the molecular vibrational schrodinger equation, thereby following the spectra of diffuse band stimulated radiation were gotten. The calculated results wore a match for the experiment in which diifuse band stimulated radiation was generated by two-photon exciting Li2.