Pr3 + doped 50ZrF4- 50(BaF2- YF3- AlF3)- x PrF3 fluoride glasses are prepared through hightemperature melt- quenching method, and the properties of photoluminescence and scintillation under different excitation conditions are studied. Experimental results show that when excited by 443 nm blue light, the optimal luminous mole concentration of f→f transition (3P0→3H4, 3P0→ 3H6 , 3P0→3F2) is 0.6 % ; when excited by X- rays, the optimal luminous concentration is 1.0 % , and with the increase of Pr3 + concentration, the fluorescence lifetime decreases from 46 ms to 21 ms, concentration quenching effect is quite obvious. The intensities photoluminescence of 4f → 5d transition which locat in the ultraviolet band increase with the Pr3 + concentration. This phenomenon is interpreted as that 4f → 5d transition energy gap is quite large,while the phonon energy of fluoride glass is low, the cross- relaxation requires several phonons, so the concentration quenching effect is too difficult to occur. Under the X- ray excitation, the ultraviolet light doesn′t be detected, while strong 486 nm light emission is generated.