With the intense demand of the developing microelectronics market, the study of giant permittivity dielectric materials is being promoted. However, it is difficult to obtain suitable dielectric materials for such applications, especially due to high dielectric loss at low frequencies. In this work, Ag+Nb codoped TiO2 ceramics were designed and fabricated in a conventional solid reaction by sintering at 1290-1340 degrees C for 5-10hours. The issue of how the microstructure and dielectric properties of (Ag1/4Nb3/4)(0.005)Ti0.995O2 ceramics are affected by the sintering conditions was discussed. By optimizing sintering conditions, a dense microstructure, a high dielectric constant (epsilon(r)approximate to 9410), and a low dielectric loss (tan approximate to 0.037) at 1kHz were achieved. Most importantly, the temperature coefficient value of epsilon(r) at different frequencies remained stable between -14.3% and 13.7% within the temperature range from -190 to 200 degrees C, which has potential applications in X9R capacitor.