Abstract: The application progress, dielectric mechanism, choice of raw materials and preparation process are reviewed for inorganic/organic functional composites with high dielectric constant at high temperature. The key is focused on the new development direction and design of some new materials according to the mechanism of high dielectric. It is pointed out that the choice and modification of fillers and polymer matrix are very important. And it is also crucial to improve phase interfaces between the fillers and ploymers and modify the surface of nanosize fillers.