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(1-x)BaTiO3-xBi(Mg0.75W0.25)O3 [(1-x)BT-xBMW,0.02≤x≤0.24] ceramics were synthesized by a two-step solidstate reaction technique.X-ray diffraction(XRD)patterns show that a systematic structure evolution from tetragonal to pseudocubic phase was observed at x=0.07.Raman spectra analysis illustrates that a change in average structure was observed with increasing x,and the local crystal symmetry which deviated from the idealized cubic perovskite structure appeared as x≥0.07.Temperature dependence of dielectric properties indicates that the phase transition temperature(Tc)decreased with increasing x.Moreover,(1-x)BT-xBMW(0.07≤x≤0.24)ceramics show good dielectric thermal stability over a wide temperature range,which indicates that these ceramics are candidates for the thermal stability devices.