①The temperature coefficient of dielectric constant and dielectric constant and its mechanical and thermal physical properties can be adjusted, and the dielectric constant is also relatively large.

②The dielectric constant of some dielectric ceramics (strong dielectric ceramics, mainly ferroelectric ceramics) can change with the intensity of the electric field, and can be used to make nonlinear capacitors, sometimes called varistor capacitors.

③Rich raw materials, low cost, easy to mass production.