Abstract: In this paper, the performance deterioration of basalt-, glass- and carbon-fiber reinforced polymer (BFRP, GFRP and CFRP) bars in five kinds of corrosive solution environments, i.e., water, strong alkali solution (pH=12.8), weak alkali solution (pH=11), simulated seawater and acid solution (pH=1.5), was investigated. The deterioration patterns of fiber-resin interfacial bonding properties, microstructure and chemical composition of FRP bars at different aging temperatures (20, 40 and 55℃) and corrosion periods (1, 2, 3, 6 and 9 months) were investigated by interlaminar shear strength, water absorption, DMA, FTIR and SEM tests. The test results show that the interlaminar shear strength of FRP bars is significantly affected by the corrosive environment, and the deterioration rate of FRP specimen in the strong alkali solution is much higher than the other four solutions. The reason is that the high concentration of OH⁻ ions accelerates the hydrolysis and etching reaction of FRP bars, causing a large number of fibers and resin debonding, which eventually leads to the reduction of interlaminar shear strength. Compared with BFRP bars and GFRP bars, CFRP bars have relatively excellent durability and higher interlaminar shear strength retention ratio under the same aging conditions.