Micropores were formed on the surface of a polyetheretherketone (PEEK) by soaking in sulfuric acid. In order to provide bioactivity to PEEK, the surfaces of the specimens were treated with glow-discharge in O2 atmosphere and Apatite Nucleus (AN) was precipitated in the pores. The bioactivity of the specimens was evaluated by using SBF and adhesive strength of formed apatite layer was measured.