La2Ti2-xTaxO7(x=0.0, 0.1, 0.2, 0.3) ceramic were prepared by conventional solid state reaction method. The crystal structure, surface morphology, ferroelectric and dielectric properties of La2Ti2-xTaxO7 ceramics have been investigated. The experimental results indicate that the substitution of Ta5+ for Ti4+ at B site to form La2Ti2-xTaxO7 solid solution can significantly enhance the ferroelectric and dielectric properties of La2Ti2O7 ceramics. At x=0.2%, ferroelectric and dielectric properties of La2Ti2-xTaxO7 ceramics reach the maximum values (Pr=0.3 μC/cm2，εr=5 600). Dielectric properties of La2Ti2-xTaxO7 ceramics are stable in the high frequency.