Tetragonal phase PZT ceramics with a tetragonality of c/a=1.027 to 1.041 were sintered at 1275$^{circ}C$ for one hour. And the directionality of domain arrangement, microstructure, dielectric and aging properties were investigated. With increasing tetragonality, the directionality of domain arrangement of 180$^{circ}$-domain on the surface is smaller than that in the internal part of specimens. Dielectric constants after poling are increased due to the increased internal energy or decreased due to the microcracks created by poling.