Since the first demonstration of Nd:YAG ceramics lasers with reasonable efficiency,rare earth doped YAG transparent ceramics have been paid more and more attention.In this report,fabrication,microstructure and properties of Nd:YAG laser ceramics are mainly discussed.Using commercial oxide powders as starting materials,Nd:YAG transparent ceramics with dense and homogeneous structure were fabricated by solidstate reactive sintering.For large scaled Nd:YAG ceramics,the grain size is about 20~30μm and the porosity is lower than 1 vol ppm.Scattering loss coefficient of the ceramics was measured to be lower than 0.002 cm-1 by use of an integrating sphere technique.