Abstract: Conducting polymers/magnetic particles nanocomposites is one of the best options to(improve) the functional materials exhibiting both magnetic properties and attractive electrical properties.These new materials may be used as microwave absorbents and shielding materials for electromagnetic (interference.) Not only the magnetic and electrical properties can be derived from the combinations of magnetic particles into conducting polymers,but also the controllable properties can be obtained by adjusting the composition and microstructure.The fundamental principle and methods of the synthesis,the structure,the properties and the application of the nanocomposites is reviewed in detail.