Strengthened methods supported by aramid sheet together with resin layer are recently separated two types, so-called type T and type S, the former is treated as isotropy and the latter is guessed as anisotropy with structural particularities. In this paper displacements and stresses in damaged RC slab strengthened by these types are individually calculated. From comparison of strengthened effect per a layer yielded by linear regression about elastic deflection of slab, equivalent number of layer in type S is determined to type T. Next residual life of type T given from wheel running tests and assumed residual life of type S are respectively discussed in consideration of strengthened effect. It is confirmed that type T is superior to type S regarding magnitude of recoverable deflection and length of residual life.
