A photonic phenomenon of fluorescence intensity reverse between red and green fluorescence was studied theoretically and experimentally in the present article. It was found by experiment that Er(0.5)Yb(9.5)∶FOV oxyfluoride vitroceramics exhibits strong fluorescence intensity reverse phenomenon. The range of the intensity reverse of Er(0.5)Yb(9.5)∶FOV was measured to be 877. Moreover, all basic spectroscopic parameters were calculated. The theoretical basis of numerical calculation for dynamics processes of all levels was established.