Variations of piezoelectric properties and compressive strength of Sr-doped PZT ceramics were investigated with poling direction. The electro-mechanical coupling constants (k31 and k33) were increased linearly with increasing poling strength. The volume fraction of intergranular fracture also increased with incresing poling strength due to weakening of grain boundaries by domain rearrangement during poling process. The internal stresses induced from the poling at 2.5 kV/mm parallel and perpendicular to the poling direction poled were 405 MPa and 89 MPa, respectively. The compressive strength of the specimen poled parallel to the poling direction was higher than that perpendicular to the poling direction.