The phase formation and electrical properties of (Bi,La) 4 Ti 3 O 12 (BLT) thin film and V-, Sm-doped BLT thin films prepared by the chemical solution deposition method on Pt/TiO 2 /SiO 2 /Si substrates have been investigated. It was observed that the microstructure and electrical properties of BLT thin films dramatically varied with V-and Sm-doping. The crystallinity and grain size of BLT thin films were definitely increased by V-and Sm-doping into BLT films, which resulted in the enhancement of remanent polarization in doped BLT films. The remanent polarization (Pr) of Sm-doped BLT films annealed for 3 min by an RTA system was about 9 µC/cm 2 . The V-and Sm-doped BLT films also exhibited good fatigue characteristics under bipolar stressing to 10 10 cycles.