<p>As the speeds of trains increase, higher demands are placed on brake materials. In order to overcome the thermal degradation phenomenon of brake pads during high-speed braking, we prepared copper fiber reinforced alkali-activated slag composite(AASC) friction materials by hot-pressing method, using slag as matrix, Na₂SiO₃·9H₂O as alkali excitant, copper fiber as reinforcement, and graphite as friction modifier. The results show that the AASC prepared by hot-pressing method has undergone alkali-activated reaction and has geopolymer amorphous characteristics as the conventional cast molding AASC by XRD analysis. The addition of copper fibers can improve the mechanical strength and toughness of the composites substantially, and the AASC has the highest flexural strength, compressive strength and impact toughness when the volume fraction of copper fibers reaches 25vol%. Toughening mechanisms such as drawing, bridging and crack deflection of copper fibers in composites were analyzed by SEM morphology. Addition of appropriate amount of graphite to AASC can effectively reduce the wear rate and improve the stability of the material friction coefficient. The coefficient of friction also remains stable in the high-speed friction experiments without thermal degradation. Therefore, copper fiber reinforced AASC friction materials prepared by hot-pressing method has good mechanical and friction properties.</p>