A batch of BaF2:PbWO4 crystals are grown up by a multicrucible temperature gradient system. The transmittance and xray exciting luminescence (XEL) spectra of these crystals were studied. The results reveal that these scintillation properties are strikingly effected by the doped BaF2 content in the crystals. Proper BaF2 content in the crystal could improve the transmittance and the XEL peak intensity and make the XEL peaks shift to longer wavelength. For the crystal grown up from the melt with BaF2 1000molppm, this raising extent becomes evident for their transmittance and the XEL peak intensity. For the crystal grown up from the melt with BaF2 2500~3000molppm, their transmittance and XEL peak intensity raise greatly. For the crystal grown up from BaF2 3500molppm, there is no evidence change for the transmittance, but its blue XEL peak intensity becomes weak and the peak width enlarged. For the crystal grown up from the melt with BaF2 5000molppm, the blue peak intensity becomes low while the green peak intensity becomes strong. The enhancingeffect of V3 Pb and VO- and ［WO3F］- tetrahedron and the weakeningeffect of Oi ,Bai and ［WO2F2］ tetrahedron are related to the phenomena.