Abstract: Researchers all over the world have made a lot of experiments and theoretical studies on the overall performance and durability of concrete beams reinforced by FRP. But their studies mostly focused on the FRP such as CFRP and GFRP,there was little experiment study on the concrete structures reinforced by BFRP which has excellent cost performance. Based on the above factors ,a total of 18 concrete beams were tested respectively in nature environment and salt spray environment under the conditions of different initial loads,the result shows that different initial loads have little effect on beams reinforced by FRP, contrast with salt spray environment and nature environment it is found that the concrete beam reinforced by FRP has good resistance to salt spray corrosion.