K2LaBr5 polycrystalline materials with different doping concentrations of Pr3+ were synthesized by high-temperature solid-state method, and the K2LaBr5∶Pr single crystals were grown by vertical Bridgman technique, and cylindrical transparent crystals with 12 mm×5 mm were obtained by a series of processing. The crystal belongs to the orthogonality system and the cell parameters has been determined as a=1.336 0 nm， b=0.992 7 nm, c=0.846 2 nm， Z=4, the crystal density is 3.908 g/cm3, the melting point is 607 ℃. The crystals were characterized by powder X-ray diffraction, X-ray excitation emission spectrum, photoluminescence spectrum, transmittance and so on. Under the excitation of ultraviolet light and X-ray, the K2LaBr5∶Pr crystal exhibits blue light (3P1→3H4), green light (3P0→3H4，3P1→3H5), orange light (3P1→3H6，3P1→3F2), red light (3P0→3F2，3P1→3F3), deep red light (3P1→3F4), purple light (3P0→3F4) and other visible wavelengths of light output in the wavelength range of 480 nm to 750 nm, which indicates that the crystal has excellent luminescent properties. Under X-ray excitation, a broadband 4f 5d-4f2 emission transition is also observed in the range of 360 nm to 440 nm. The scintillation decay time of K2LaBr5∶Pr crystal is about 10 μs, which is measured by the steady-state transient fluorescence spectrophotometer, and the transmittance of the crystal in the visible range is 88% measured by the ultraviolet-visible spectrophotometer.