Abstract: The glass fiber, basalt fiber and carbon fiber surface were modified by laser, and three kinds of fiber/epoxy resin composites were prepared. The surface morphology and the mechanical properties of three kinds of fiber as well as the mechanical properties and the fracture morphology of three kinds of fiber/epoxy resin composites were characterized by SEM and universal testing machine. The effects of surface modification on the mechanical properties of the composites were studied. The results show that the laser surface modification of fibers can enhance the mechanical properties of carbon fiber/epoxy resin composite to the highest, in which the maximum tensile strength increases by 77.06% and the impact strength increases by 31.25%, while the improvement for basalt fiber/epoxy resin composites take the second place, however, the mechanical properties of glass fiber composites decrease. So the carbon fiber and basalt fiber are suitable for the surface modification by laser.