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In order to improve the interfacial adhesion between PBO fiber and epoxy resin, the surface modification method of chemical treatment was employed. It was demonstrated that the interfacial shear strength (IFSS) of the micro-composite system increased by 24% compared with the control sample, which was measured by the singer fiber pull-out test. Furthermore, the surface morphology of the fiber was investigated by SEM and the wettability between the sample and water was characterized by the droplet-shape profile.