Using plate like Sr3Ti2O7 particles as templates, textured Sr3Ti2O7 ceramics of orientated grains were fabricated by Templated Grain Growth (TGG) technique combining with tape casting method. The effects of the microstructure of textured Sr3Ti2O7 ceramics annealed in reducing atmosphere Ar were investigated. The results showed that the main crystalline phase of the ceramics sintered at 1 500 ℃ for different soaking times were Sr3Ti2O7, the preferred orientation of the grain morphology was along (00l) crystal plane, of which the texture fraction increased with the increasing of soaking times. Phase transformation occurred on the surface of the textured Sr3Ti2O7 ceramics annealed in Ar atmosphere, generating a new phase Sr2TiO4. With the increase of the annealing temperature and annealing time, the content of Sr2TiO4 decreased. The texture fraction degraded after the annealing. The dielectric constant parallel and perpendicular to the tape casting direction showed anisotropy and the dielectric loss decreased after annealing.