Abstract: In this work，BaMgAl10O17：Eu2+（BAM）phosphors were coated with MgF2 by the mechanical rubbing process. The surface morphology and the crystal structure were characterized by SEM，IR and XRD，respectively. The results indicated that the surface of BAM phosphors were evenly coated by MgF2 and the crystal structure of the coated BAM phosphors remained the same as the uncoated samples，i.e. after surface treatment，the luminance centre of Eu2+ did not shift，which still emitted wavelength of about 450 nm. The surface components of BAM phosphors coated with MgF2 were analyzed qualitatively by EDS. The emitting spectra of BAM phosphor particles coated with MgF2 and without coating were investigated under 254.7 nm excitation. The results demonstrated that the initial luminance of coated BAM phosphors was lower than the uncoated samples. But after roasting at 550℃ for 30min，the luminance degradation of the coated BAM phosphors was improved greatly. This method is simple，convenient and economical as compared with other methods.