Abstract: The Pb_1-xLa_xTiO₃(PLT) thin films were fabricated by Sol-gel spinning process on Pt/Ti/SiO₂/Si(100) substrates.Effects of La dopant on dielectric and ferroelectric properties were investigated.From the analysis,the coercive field and remnant polarization are found to decrease with increasing La concentration,while the dielectric constant and the loss tangent are found to increase according to the increase of La concentration.The film annealed at 600 ℃ for 1 h shows perovskite phase and preferential (100) orientation,and has typical hysteresis loops.