[en] Glass-ceramics with a molar composition of 1.0MgO.1.2Al₂O₃.2.8SiO₂.1.2TiO₂.0.6CeO₂, was prepared by one-step crystallization heat treatment of the parent glass at different temperatures for 2 h. The crystallization behavior and microwave dielectric properties of the materials were investigated by differential scanning calorimeter (DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and network analyzer. The investigations show that the exothermic peaks in the range of 841-1220 deg. C are corresponding with perrierite (Ce₂Ti₂Si₂O₁₁), magnesium aluminotitanate (Mg₂Al₆Ti₇O₂₅, MAT), rutile (TiO₂), α-cordierite (Mg₂Al₄Si₅O₁₈) and ceria (CeO₂), respectively. The microwave dielectric properties are correlated with the treatment conditions. With the heat-treatment temperature is increased in the range of 1100-1250 deg. C, the dielectric constant (ε_r) of the material varies in the range of 10.99-11.73. It increases first and then decreases, with the maximum value of 11.73 appearing at 1200 deg. C. At the same time, the quality factor (Q x f, Q 1/tan δ, f = resonant frequency) of the material shows the similar variation, with a maximum value of 17,3000 GHz appearing at 1200 deg. C. However, the temperature coefficient of resonance frequency (τ_f) of the material increases from 26.3 to 75.9 ppm/deg. C because of the increase in the perrierite phase. A new glass-ceramic with excellent microwave dielectric properties of ε_r = 11.73, Q x f = 17,300 GHz, τ_f = 48.5 ppm/deg. C, was obtained in this study