The absorption, emission, excitation spectra, and polarized luminescence of titanium centers in lithium and sodium fluorides are studied. The 2.42 and 3.1 eV emissions in LiF:TiO, and 2.2 and 2.95 eV emissions in NaF : TiO,: MgF, are related to the electronic transitions of titanium centers. The low energy emissions at relatively low temperatures have the same azimuthal dependence of the polarisation degree as the emission of oscillators oriented along the C, crystal axis. The high energy emissions are polarized along the C, crystal axis. The high temperature stability of the polarization degree shows that the luminescence centers have point defects near the titanium ion. The efficiency of transformation of titanium luminescence centers by X-irradiation grows above 200 K. This points out that the cation vacancies are part of luminescence centers. A model of titanium lumineacence centers in lithium and sodium fluorides is suggested. The center consists of a Ti4+ ion a t cation site, an 02ion a t anion site, and two associated cation vacancies.k3CCJIeLIOBaHbI CIleHTpbI nor~10Iqe~~f1, H3JIYW%HH, BO36yXp2HHR Pi ITOJlfipM30BaHHaR JIlOMHHeClleHUHR THTPHOBMX UeHTpOB B KpHCTaJIJIaX +TOpHCTOrO JIHTMH H HaTpHH. 2,95 eV BO q)TOPMCTOM HaTPHM 06J' cJlOBJIeHO 3JIeKTpOHHbIMH IIepeXOHanlH B THT;IHOBhlX CseseHue c MaKcuMyMam ~O J I O C npn 2,42 a 3,l eV BO $TOPACTOM JIATHU H n p~ 2,2 H