BaSn0.15Ti0.85O3/Ba0.6Sr0.4TiO3/BaZr0.2Ti0.8O3 multilayer, BaSn0.15Ti0.85O3/Ba0.6Sr0.4TiO3 and Ba0.6Sr0.4TiO3/BaZr0.2Ti0.8O3 bilayer composite thin films are deliberately grown on Pt-Si substrates by pulsed laser deposition. The multilayers exhibit preferential growth along the (1 1 0) direction and reveal prominently enhanced dielectric tunable performance compared to the previous reported single-layer dielectric tunable thin films, the BaSn0.15Ti0.85O3/Ba0.6Sr0.4TiO3 and Ba0.6Sr0.4TiO3/BaZr0.2Ti0.8O3 bilayers at room temperature. For the multilayers, a large tunability of 71.3% under bias electric field of 400 kV/cm is achieved, while the dielectric loss is 0.0063 and the leak current density is ∼1.0 × 10−10 A/cm2 at 300 kV/cm. Calculation of figure of merit (FoM) shows a large value of 113. Such outstanding properties have suggested that BaSn0.15Ti0.85O3/Ba0.6Sr0.4TiO3/BaZr0.2Ti0.8O3 multilayer composite thin films are excellent candidates for electrically steerable applications.