Stone protection: Choose the correct stone protection agent to effectively reduce the water absorption rate of the stone; When using the wet bonding method to pave the ground, it is necessary to overlay the use of stone bottom protective agents that have a sealing effect and do not reduce the cement bonding force. Stone protection should be reasonable. The protection on the back of the stone is more important than the surface, and both hydrophobicity and sealing should be considered. Water-based protective agents should not be used on the front as much as possible, and solvent-based protective agents with good permeability should be used. When the surface protection layer reaches 3-5mm or more, it will greatly reduce the occurrence of stone lesions.