Abstract: In the report， the interfacial bond durability performance of FRP bars with seawater marine sand concrete （SWSSC） was analyzed under immersion in a real seawater environment. The test variables include FRP bar types （GFRP bars， BFRP bars and SFCB bars） and immersion time （30 d， 90 d， 180 d and 270 d）， and the central pull-out test was performed to compare and analyze the interfacial bond degradation of the three types of bars with SWSSC. Based on the obtained data， the degradation of long-term ultimate bond strength of the three types of bars under immersion in a real seawater environment was predicted. The results showed that the wear of the surface ribs of GFRP bars is smaller than that of BFRP and SFCB bars due to the long-term immersion in seawater and the difference of manufacturing process of different FRP bars； the residual section fluctuation of the bond stress-slip curve of BFRP and SFCB bars gradually decreases； the ultimate bond strength of BFRP and SFCB bars degrades faster than that of GFRP bars. Based on the predicted results， the ultimate bond strength degradation values of the three types of bars in the marine， outdoor， and indoor environments are obtained during the design service life.