Polarized Raman spectra of single crystal KTiOPO4 have been measured in the wavenumber shift range 10-4000 cm-1 at 300K and 210K. The infrared absorption spectrum of KTiOPO4 has also been measured in the 200-4000cm-1 range for powder samples dispersed in the pressed KBr disks. An assignment of the spectra is given hy using the group theory. Some characteri tics in the spectra have been investigated.