Abstract: In order to reveal the interfacial bond behavior between circle steel tube and recycled aggregate concrete (RAC) after exposure to high temperatures, a push-out test of 20 specimens after exposure to high temperatures was designed and completed by considering two parameters, the maximum temperature (T) and the replacement percentage (γ). The failure process and morphology of the specimens were observed, the load-slip curves of the loading end and the free end were obtained, and the influences of test parameters on interfacial bond behavior and bond damage process were analyzed. The regression bond strength formulas and bond-slip constitutive equations of RAC-filled circle steel tube (RACFCST) subjected to high temperatures were proposed. The results show that the shape of load-slip curves can be divided into two types according to the maximum temperature (i.e., T≤400 ℃ and T=600 ℃). The curves shape at the loading end and the free end are similar and the initial slip at the loading end develops earlier. The interfacial bond behavior of RACFCST is similar to that of CFCST (the average performance difference of them under different replacement percentages is within 11%). The bond strength decreases at first and then increases with the increase of T and γ. With the increase of T, the bond shear stiffness first decreases, and then increases and finally decreases, and the energy dissipation capacity of interface increases gradually. Moreover, the bond shear stiffness and the energy dissipation capacity show the law of first increasing followed by decreasing and finally increasing with the increase of γ. Raising the temperature will induce the early occurrence of bond damage and then postpone it, but the effect of γ is not obvious. The growth of bond damage increases first and then decreases with the increase of T and γ.