High volume resistivity and surface resistance of Poly-ether-ether-ketone (PEEK), which is a kind of semi-crystalline aromatic thermoplastics with outstanding features, restrict their use in the fields of electronics and electromagnetic. In order to broaden the application range in the aerospace and electronics, PEEK with high chemical inert was modified by 1064nm-wavelength infrared pulse fiber laser. The properties of PEEK, such as surface micromorphology and roughness, were characterized by SEM and metallographic microscope, respectively. The results show that, in the fixed overlap rate of spot, the interaction between laser and PEEK is changed from photothermal reaction at low laser energy density to photochemical-photothermal synergy with high laser energy density. In this case, the surface of PEEK is gradually changed from periodic undulating groove structure to obvious melting material accumulation, meanwhile, the periodic fluctuation boundary is gradually blurred. In addition, when the laser energy density is fixed, the thermal accumulation effect is enhanced with the increase of the overlap rate of spot, which leads to the transition of PEEK surface from lattice hole structure to periodic groove structure, and then gradually covered by molten accumulation.
