High-dielectric-constant and low-loss ceramics in the (1-x)Ca4MgNb2TiO12-xCaTiO(3) system have been prepared by the conventional solid-state route. The forming of complete (1-x)Ca4MgNb2TiO12-xCaTiO(3) solid solutions were confirmed by the X-ray diffraction pattern analysis and the measured lattice parameters, which linearly varied from a=5.5478 A, b=7.7710 A, and c=5.4543 A for x=0.1 to a=5.4718 A, b=7.6799 A, and c=5.4262 A for x=0.9. By increasing x, not only could the tau(f) of the ceramics be turned to a near-zero value (similar to-6.9 ppm/degrees C) at x=0.3, a substantial Q x f (similar to 20 200 GHz) and epsilon(r) (similar to 43.88) could also be achieved simultaneously.