Abstract: Modified basalt fiber (MBF) has been prepared by surface treatment of basalt fiber (BF) with γ -aminopropyl triethoxysilane (KH550), Ehtpb-based polyurethane (EPU) containing epoxy groups has been synthesized with epoxy-terminated hydroxyl polybutadiene (EHTPB) as matrix, the damping material MBF@EPU has been prepared by epoxy ring-opening reaction between MBF and EPU. The surface morphology and structure of basalt fiber before and after modification and polyurethane were characterized by SEM, FTIR and XPS. The results show that MBF and MBF@EPU are successfully prepared. The results of dynamic thermomechanical analysis (DMA) and tensile test show that basalt fiber can improve the damping and mechanical properties of EPU, The effective damping temperature range of 10MBF@EPU is 140.0℃, the tensile strength is 8.68 MPa and the elongation at break is 329.04%, showing the best comprehensive performance.