Abstract: To clarify the durability performance of basalt fiber-reinforced polymer (Basalt Fiber-Reinforced Polymer,BFRP) bar-reinforced timber structures under alternating dry-wet conditions. The degradation law and interfacial deterioration mechanism under dry-wet cycles were studied. Results showed that increasing dry-wet cycles changed the failure mode from wood shear failure to adhesive interface failure. The ultimate load and average bond strength decreased gradually with increasing cycle days, the bond strength of the specimens was reduced by 11.5%, 21.5%, 27.2%, 32.7%, and 35.0%, respectively. A bond strength prediction model was established by fitting test data. The deviation between test and predicted values was mostly within 10%.A bond-slip relationship model was developed based on BPE and CMR models. The predicted curves showed close agreement with experimental curves.