Experiment of studying bonding performance was designed and 30 concrete specimens bonded with CFRP sheets were investigated.To verify the effect of interface bond properties,a detailed study were analyzed in term of the failure model of CFRP sheet-concrete interface,bond stress transfer process,CFRP strain distributions and developing process of debonding failure.The results show that the bond stress transfers from the load direction to the free end of CFRP gradually,which causes instantaneous failure of structure;most failure modes are debonding failure in CFRP sheet-concrete interface and the effective bond length can be observed to be about 100 mm.The test method designed by authors is also verified to be practicable through the results,which provides a new idea to obtain the bond strength of CFRP sheet-concrete interface.