Abstract: The explicit expression for effective elect roelastic moduli of piezoelect ric ceramic/ polymer biphase piezocomposite was obtained by employing Eshelby’s model and Mori-Tanaka average field theory. The expression canreflect physical insight for piezocomposites. As a practical example , the coupled elect roelastic behaviors were analyzed for a piezoelect ric elliptic cylindrical fiber reinforced polymer composite. The result s show that the averageelect roelastic moduli depend on the coupled elect roelastic effect s which have relations to the connectivity , volumef raction and the shape of piezoelect ric inclusions. The origin of the coupling effect s is related to the existence of mismatch elect roelastic moduli of constituent s.