The results show that the aqueous tape casting method is a promising route to prepare transparent YAG composite structure ceramics. The quality of the ceramics can be improved by adjusting the technology and optimizing the parameters. The most important role of this method is that complex structure laser ceramics and ceramics with gradient composition can be obtained if different doping compounds are designed and added in the ceramics. The heat distribution among the laser ceramics would be arranged more homogeneously. As a result, the laser quality would be improved significantly.