The contents of this book include properties analysis on functional dieletric material used in the electrical engineering; electroactive polymers;(EAPs); electromechanical and magnetoelectric properties of electrects; electrical conduction, energy transfer and chemical changes of electrical insulating polymers under the influence of the high voltage corona discharge; piezoceramic sensor and actuator. The fields of this book cover the electric engineering, mechanic engineering and material science. This book is suitable for use as a textbook and reference book for undergraduate and graduate students who are interested in the research of functional dielectric materials and insulating polymers. This book is also suitable for professionals who work in the fields of insulating materials, EAPs, energy conversion, sensors and actuators ect.