The investigation on laser sintering of Bi4Ti3O12 ceramics is reported. The green patch of Bi4Ti3O12 ceramic was sintered by a CO2 laser, with power density 20～30 W/cm2 and sintering temperature around 1000 ℃. Compared with that sintered by conventional solid-state reaction technique ,the density of Bi4Ti3O12 ceramic sintered by laser is higher, reaches 95% of the theoretical one ,the piezoelectric constant was increased by 60% , the decrease of coercive field and easier polarization indicated that the enhancement of the ferroelectric properties. By using the X-ray diffraction (XRD), scanning electron microscope (SEM), the phase, microstructure, and the mechanism of property modification in laser sintered Bi4Ti3O12 ceramics were analyzed. It’s indicated that the measure of laser sintering could be regarded as one of the ways to sinter the functional ceramics.