Interestingly, the relaxor ferroelectric polymers exhibit large electrostriction and high room temperature dielectric constant, which are attractive for a broad range of applications such as acoustic transducers, microactuators in MEMS, and electro-optic devices. These advances indicate the great potential of polymeric materials for achieving high func-tional responses compared with their inorganic counter-parts,as well as the great need to understand the molecular origins of these responses.