Ferroelectric polymers belong to an important family of functional materials which have thermodynamically stable spontaneous polarization states switchable by application of a sufficiently strong external electric field. Studies on the ferroelectric polymers are increasingly motivated by their exceptionally excellent electric properties. They are worth exploring as high electric energy density capacitors, electromechanical actuators, piezoelectric or pyroelectric sensors, gate dielectrics in thin-film field-effect transistors (FETs), and rewritable/non-volatile ferroelectric memories.