The processing characterizations and the sintering effects of laser sintering were researched and presented with the tests of different functional ceramics, such as Ta2O5, Al2O3, BaTiO3, Na0.5K0.5NbO3 (NKN). It is shown that the temperature field consisting of homogenized temperature along the radial and proper temperature gradient along the axes of the ceramics is the key point for sintering. As a rule, the laser power for sintering high melting point (2000 ℃) ceramics is up to 103～104 W/cm2. The absorptivity of materials for a certain value of wavelength, the material of sample stands and the power adjustment curve should also be concerned. The special structural and morphological properties of the non-equilibrium high temperature phase, grain-oriented microstructure and high density in the laser-sintered ceramics were also shown. As a progressive and effective means for preparation of functional ceramics, laser sintering technique has been shown be worthy of extensive investigation.