This experiment consists of4T section reinforced concrete beams.To simulate the initial damage of the beams in practical engineering, the tested beams are presplitted with preloading. Two variable which are suspected influencing flexural performance of NSM FRP rods to concrete have been investigated, such as:the surface characteristics of FRP and the FRP materials. This paper focuses on the failure pattern capacity、stiffness、deformation crack distribution、the strain of the FRP rods and steel bars、bond shear...