Lanthanum modified lead zirconate titanate (abbreviated as PLZT) Electro-Optical ceramics with various Bi concentration were prepared by a hot-press process. The PLZT ceramic samples all present a single perovskite structure with no second phase detected. Bi³⁺ ion was considered to mainly enter the A-site of perovskite ABO₃ structure of PLZT ceramics by the X-Ray Diffractionanalysis. The maximum permittivity (ε_m) of the PLZT samples decreased obviously as Bi concentration increased, while their remnant polarization (P_r) decreased slightly. In particular, the PLZT sample with 0.14 wt% Bi doping presented a higher optical transmittance 61.8% (λ = 633 nm), and its electric-induced light scattering performance was found to be improved obviously, the maximum light deduction value of ~47.6% was obtained.