Abstract: Since fiber reinforced polymer (FRP) has excellent corrosion resistance, it can be used to replace ordi-nary steel bars to solve the problem of steel corrosion. Because of the abundant coral and seawater resources in China, using coral instead of traditional sand aggregate is one of the effective methods to solve the problem of scarcity of traditional materials in island construction. Bonding property between FRP bars and coral aggregate seawater concrete is one of the important factors to determine whether FRP reinforced coral aggregate seawater concrete structure can be applied in practical engineering like ordinary reinforced concrete structure. At present, there is little research on the interfacial bonding property of FRP reinforced coral aggregate seawater concrete structure, especially in theory. Therefore, the rationality of the simplified bilinear model will be verified by experiments and numerical simulation. Based on the experiments and numerical simulation, the expressions of interfacial bonding stress and relative slip of FRP reinforced coral aggregate seawater concrete will be derived, and then the distribution maps of interfacial bonding stress and relative slip will be plotted. The theoretical solution obtained by the expression will be compared with the experimental and numerical simulation solution. The results show that the theoretical solution obtained by theoretical calculation is in good agreement with the experimental results. The increase of FRP bar diameter and bonding length will lead to more non-uniform distribution of interfacial bonding stress and relative slip. The change of coral aggregate concrete strength has little effect on the distribution of interfacial bonding stress and relative slip. The interfacial bond stress and relative slip distribution of glass fiber reinforced polymer (GFRP) and basalt fiber reinforced polymer (BFRP) reinforced coral aggregate seawater concrete are similar, and are more uniform than that of carbon fiber reinforced polymer (CFRP) coral aggregate concrete.