Tantalum-doped TiO2 thin films were deposited on glass substrates by pulsed laser deposition (PLD). Their optoelectrical properties were studied. The optical band gap was found varying between 3.26 and 3.49 eV when the oxygen partial pressure increases from 0.3 to 0.7 Pa. The dependence of electrical property of the films on temperature was measured to identify the dominant conduction mechanism. It was found that thermally activated band conduction was the dominant conduction mechanism in the temperatures range of 150 to 210 K. Whereas, in the temperature region of 10 to 150 K, the dependence of the conductivity on temperature followed Mott’s variable range hopping (VRH) model. Moreover, the temperature dependence of resistivity for the films can be described by～ exp(b/T)1/2 at temperatures from 210 to 300 K.