To improve the electro-induced strain and to decease the hysteresis of that W $O_3$dopant of which amount is 0~0.8wt% was added to (P $b_{0.73}$/B $a_{0.27}$)(Z $r_{0.75}$/ $Ti_{0.25}$) $O_3$+0.1wt% $Y_{2}$/ $O_3$ceramics. At the specimen with 0.4 wt% W $O_3$the electromechanical coupling coefficient( $K_{31}$ ) showed the maximum value of 23.6% at D.C 10 kV/cm electric field. At the same W $O_3$addition amount the piezoelectric constant( $d_{31}$ ) and the electro-induced strain($Delta$$ell$/$ell$)showed the highest values of 182$ imes$10$^{-12}$ [C/N] 210$ imes$10$^{-6}$ $Delta$$ell$/$ell$at D.C. 10 kV/cm electric field. respectively0 kV/cm electric field. respectivelyvely