Two different surface treatment methods,single treatment process(such as "chemical treatment","plasma treatment","coupling treatment"and"radiation treatment") and combined treatment processes(such as"radiation & plasma treatment"and"radiation & plasma & coupling treatment") were used for the surface modification of PBO fiber,respectively. Then,the tensile strength,contact angles and interface bonding strength of the treated fibers were tested. The results show that,PBO fibers treated by the combined ways have better integrate...