The photostimulable luminescence (PSL) of Eu2+: BaFCl phosphors is studied through changing the energy of UV-irradiation. There are obviously difference of PSL both the energy of irradiation is larger than that of the minimum excitation and the energy of ultraviolet irradiation is smaller than that of minimum excitation. The reasons for the above difference are discussed and the location of the transform energy levels of ultraviolet irradiation from excitation to bleaching is given.