Concentration effect on the ultraviolet absorption spectrum, visible blueemndssion spectra and the corresPOndent excitation spectra of Ti: Al2O3 crystal had beeninvestigated. At liquid nitrogen temperature,the brosd 420 urn blue emission bandsplitted intO 330 um, 420 um, 460 um and 560 um sub-bands, which were attributedrespectively to the F+ and F centers of the host Al2O3 lattice and Ti4+ related chargetransfer transitions among ligsnds and metal ions. Concentration quenching of the blueemission at room temperature was the co-effect of the emission quenching related to Ti4+ ions and the increasing of the blue-green band absorption corresponding to Ti3+ ions. Absorption band peaked at 266 nm in the ultraviolet absorption spectrum was constructed by charge transfer transtions of Ti4+ and Fe3+ ions in Ti:Al2O3 crystal.