In order to study on the bonding behaviour of TRC for strengthening,the shear experiment research on TRC strengthening layer and the old concrete are performed in this paper.The effects of different interfacial techniques,i.e., artificial chiseling,and reinforced bar planting,on the shear properties are investigated,and the influence law of different roughness and ratio of planting reinforced bar on the interface shear strength are studied.The experimental results show that the bonding behaviour between TRC sheet and old concrete are improved prominently by the above two different interfacial techniques.The shear strength of specimens increases greatly when the technique of artificial chiseling is used,and the range of 2.0-4.0mm is recommended as the best average sand-pouring depth.Furthermore,reinforced bar planting can also improve the shear strength and ductility of the specimens.