The possible collapsing blocks distributed over the carvings area of Laitan must be reinforced because they are seriously imperiling the safety of carvings and visitors. In this paper, the analyzing and evaluation method of stability of possible collapsing blocks in the carved stone area is introduced. Application of new technology of prestressed anchor in reinforcing the collapsing blocks of cliff is described according to an engineering example. The construction technology and the repairing effect are discussed in detail. Prestressed anchor can effectively increase the ultimate upright resistance of anchor and reduce anchor number, thus reduce the damage to the surface of carvings rockmass. The project has been evaluated as of high quality grade. The reinforcing technology by prestressed anchor can be popularized in the protection engineering of the ground cultural relics in China.