In order to study the application of HRBF500 high-strength rebar on reinforced concrete beams in port pngineering,we carry out an experiment of reinforced concrete beams with HRBF500 rebar as stirrups under concentrated load based on normative clauses of design code for concrete structures of port and waterway engineering.The propagation laws of diagonal crack and failure mode are observed under different external loads.The load values are collected under different stress state of the beams.Shear capacity and diagonal crack width during the limit state of serviceability considering influence coefficient of long-term loads are analyzed based on normative clauses of load code for harbour engineering.The results indicate that the propagation laws of diagonal crack of the beams with high-strength stirrups are basically the same to the ordinary beams and the strength of rebar can be fully utilized.The shear capacity and diagonal crack width considering the effect of long-term loads in the normal service stages can satisfy the requirement of design code for concrete structures of port and waterway engineering,which is safe enough.