Abstract: BaZr_0.25Ti_0.75O₃ nanoparticles were prepared by a one-step hydrothermal method. The nanoparticles were spherical in shape, containing the elements of barium, zirconium, titanium and oxygen. The composition analysis showed that the as-prepared nanoparticles correspond to BaZr_0.25Ti_0.75O₃. PVDF/BaZr_0.25Ti_0.75O₃ nanocomposite films were prepared by solution casting with BaZr_0.25Ti_0.75O₃ nanoparticles as fillers, and their dielectric properties were characterized. The results showed that when the content of BaZr_0.25Ti_0.75O₃ increased from 0 to 40 wt%, the dielectric constant increased from 9.6 to 12.7 (1 kHz). The dielectric constant and the dielectric loss of the film can be observed in two different stages with the increase of frequency. At low frequency (<10 kHz), the two-phase interface polarization gave rise to a larger dielectric constant with a corresponding larger space charge polarization loss. When the frequency increased, the orientation polarization and space charge polarization inside the material decreased, and the dielectric constant and dielectric loss decrease accordingly. At high frequency (>10 kHz), the dielectric constant showed a continuous decrease and the dielectric loss increased rapidly due to the glass transition process. The experiments involve the preparation, characterization, and analysis of inorganic ceramic nanoparticles and their nanocomposites, from which a comprehensive experiment could be developed to cultivate students’ interest in scientific research and lay a foundation for students to engage in scientific research or production.