Abstract: Pullout tests were carried out on 27 prismatic specimens with 630 MPa high-strength reinforcement to investigate the bond properties of high strength rebars embedded in ultra-high-performance concrete (UHPC). Respectively studied were Failure modes of 630 MPa high-strength steel bar embedded in UHPC and the effects of fiber volume content, relative protective layer thickness, anchorage length and stirrups configuration. The formula of bond-anchorage length is proposed by the reliability analysis. The results obtained show that the failure modes of 630 MPa high-strength steel bar embedded in UHPC include splitting pull-out failure and pull-out one. The addition of steel fiber can improve the failure pattern of the specimen. The ultimate bond strength increases with the growth of fiber volume content and stirrup ratio while decreases as the growing of anchorage length and rebar diameter. Increasing the volume content of steel fiber and the relative thickness of protective layer can effectively improve the energy dissipation capacity of components. Based on 404 domestic and overseas test data, derived is the ultimate bond strength formula of steel bar and UHPC, which is consistent with the experimental results. According to the reliability analysis of JC method, the basic anchorage length calculation formulas of Standard for Design of Steel Fiber Reinforced Concrete Structures (JGJ/T 465 − 2019) can not be applied to UHPC structures. The suggested formula for calculating the bond-anchorage length between steel bar and UHPC is developed, and the design value of critical anchorage length of 630 MPa steel rebar is proposed.