The resonant photoacoustic effect in laser induced fluorescence (abbreviated as fluorescence acoustic resonance effect) of CDC13 is described. The difference of this effect from general photoacoustio effect is pointed out. The theoratioal formulae of physical parameters, such as the sound velocity, the second virial coefficient, the sound absorption coefficient. The relaxation times of molecule inner modes, the viscosity coefficient, and the thermal conductivity coefficient, which could be determined using the fluorescence acoustic resonance effect are given. As an example the specific values of the above mentioned physical parameters for CdCl3 are shown.