Microwave dielectric ceramic BaTi4O9 was synthesized by laser rapid solidifcation(LRS) with CO2 laser.As-synthesized BaTi4O9 has a higher density(relative density is 99.6%.The analysis of X-ray diffraction(XRD) reveals that the samples are of highly pure phase and the grains grow along the c-axis direction with a high lotgering factor of 0.46.The observation of scanning electron microscopy(SEM) shows that the so-synthesized ceramics are composed of plate-like microstructures parallel to the laser incident direction.The dielectric constant,dielectric loss and temperature coefficient of dielectric constant are 85,0.083 and 1.96×10-4 at 1 MHz,respectively.The strong temperature gradient in the sample′s interior generated during the solidification process results in the appearance of textured microstructure and the improvement of dielectric constant.